diff --git a/README.md b/README.md
index 1133c49..2507025 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ Monorepo of plugins for [markdown-it.rs](https://crates.io/crates/markdown-it):
 - [markdown-it-heading-anchors](crates/heading_anchors/README.md)
 - [markdown-it-autolink](crates/autolink/README.md)
 - [markdown-it-deflist](crates/deflist/README.md)
+- [markdown-it-gfm](crates/gfm/README.md)
 
 More to come... (hopefully, many from [mdit-py-plugins](https://github.com/executablebooks/mdit-py-plugins))
 
diff --git a/crates/gfm/Cargo.toml b/crates/gfm/Cargo.toml
new file mode 100644
index 0000000..5f30829
--- /dev/null
+++ b/crates/gfm/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "markdown-it-gfm"
+version = "0.0.0"
+description = "A markdown-it plugin for parsing definition lists"
+readme = "README.md"
+license = "Apache-2.0"
+authors = { workspace = true }
+repository = { workspace = true }
+keywords = { workspace = true }
+categories = { workspace = true }
+edition = { workspace = true }
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+markdown-it = { workspace = true }
+markdown-it-tasklist = { path="../tasklist", version = "0.2.0" }
+markdown-it-autolink = { path="../autolink", version = "0.2.0" }
+markdown-it-heading-anchors = { path="../heading_anchors", version = "0.3.0" }
+regex = { workspace = true }
+
+[dev-dependencies]
+dev = { path = "../dev" }
+testing = { workspace = true }
diff --git a/crates/gfm/LICENSE b/crates/gfm/LICENSE
new file mode 100644
index 0000000..b09cd78
--- /dev/null
+++ b/crates/gfm/LICENSE
@@ -0,0 +1,201 @@
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diff --git a/crates/gfm/README.md b/crates/gfm/README.md
new file mode 100644
index 0000000..df40b18
--- /dev/null
+++ b/crates/gfm/README.md
@@ -0,0 +1,17 @@
+# markdown-it-gfm
+
+[<img alt="crates.io" src="https://img.shields.io/crates/v/markdown-it-gfm.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/markdown-it-gfm)
+
+A [markdown-it.rs](https://crates.io/crates/markdown-it) plugin to implement [Github Flavoured Markdown](https://github.github.com/gfm).
+
+## Usage
+
+To load the plugin:
+
+```rust
+let parser = &mut markdown_it::MarkdownIt::new();
+markdown_it_gfm::add(parser);
+
+let root = parser.parse("https://github.github.com/gfm");
+assert_eq!(root.render(), "<p><a href=\"https://github.github.com/gfm\">https://github.github.com/gfm</a></p>\n");
+```
diff --git a/crates/gfm/src/lib.rs b/crates/gfm/src/lib.rs
new file mode 100644
index 0000000..1a7704d
--- /dev/null
+++ b/crates/gfm/src/lib.rs
@@ -0,0 +1,49 @@
+//! A [markdown_it] plugin for parsing Github Flavoured Markdown
+//!
+//! ```rust
+//! let parser = &mut markdown_it::MarkdownIt::new();
+//! markdown_it_gfm::add(parser);
+//! let root = parser.parse("https://github.github.com/gfm");
+//! assert_eq!(root.render(), "<p><a href=\"https://github.github.com/gfm\">https://github.github.com/gfm</a></p>\n");
+//! ```
+use markdown_it::parser::inline::builtin::InlineParserRule;
+use markdown_it::plugins::html::html_block::HtmlBlock;
+use markdown_it::plugins::html::html_inline::HtmlInline;
+use markdown_it::{parser::core::CoreRule, MarkdownIt, Node};
+use regex::Regex;
+
+/// Add the GFM plugin to the parser
+pub fn add(md: &mut MarkdownIt) {
+    markdown_it::plugins::cmark::add(md);
+    markdown_it::plugins::extra::tables::add(md);
+    markdown_it::plugins::extra::strikethrough::add(md);
+    markdown_it::plugins::html::add(md);
+    md.add_rule::<TagFilter>().after::<InlineParserRule>();
+    markdown_it_tasklist::add_disabled(md);
+    markdown_it_autolink::add(md);
+}
+
+/// Add the GFM plugin to the parser, plus heading anchors
+pub fn add_with_anchors(md: &mut MarkdownIt) {
+    add(md);
+    markdown_it_heading_anchors::add(md);
+}
+
+/// Implement the Disallowed Raw HTML (tagfilter) rule
+struct TagFilter;
+impl CoreRule for TagFilter {
+    fn run(root: &mut Node, _md: &MarkdownIt) {
+        let regex = Regex::new(
+            r#"<(?i)(iframe|noembed|noframes|plaintext|script|style|title|textarea|xmp)"#,
+        )
+        .unwrap();
+        root.walk_mut(|node, _| {
+            if let Some(value) = node.cast_mut::<HtmlBlock>() {
+                value.content = regex.replace_all(&value.content, "&lt;$1").to_string();
+            }
+            if let Some(value) = node.cast_mut::<HtmlInline>() {
+                value.content = regex.replace_all(&value.content, "&lt;$1").to_string();
+            }
+        });
+    }
+}
diff --git a/crates/gfm/tests/fixtures.rs b/crates/gfm/tests/fixtures.rs
new file mode 100644
index 0000000..be25e61
--- /dev/null
+++ b/crates/gfm/tests/fixtures.rs
@@ -0,0 +1,13 @@
+use std::path::PathBuf;
+use testing::fixture;
+
+#[fixture("tests/fixtures/spec*.md")]
+fn test_spec(file: PathBuf) {
+    let f = dev::read_fixture_file(file);
+
+    let parser = &mut markdown_it::MarkdownIt::new();
+    markdown_it_gfm::add(parser);
+    let actual = parser.parse(&f.input).xrender();
+
+    dev::assert_no_diff(f, &actual);
+}
diff --git a/crates/gfm/tests/fixtures/_spec_493.md b/crates/gfm/tests/fixtures/_spec_493.md
new file mode 100644
index 0000000..d726a33
--- /dev/null
+++ b/crates/gfm/tests/fixtures/_spec_493.md
@@ -0,0 +1,8 @@
+Example 493 (https://github.com/rlidwka/markdown-it.rs/issues/29)
+......
+
+This will ~~~not~~~ strike.
+
+......
+
+<p>This will ~~~not~~~ strike.</p>
diff --git a/crates/gfm/tests/fixtures/_spec_632.md b/crates/gfm/tests/fixtures/_spec_632.md
new file mode 100644
index 0000000..b7d4610
--- /dev/null
+++ b/crates/gfm/tests/fixtures/_spec_632.md
@@ -0,0 +1,17 @@
+Example 632
+......
+
+a.b-c_d@a.b
+
+a.b-c_d@a.b.
+
+a.b-c_d@a.b-
+
+a.b-c_d@a.b_
+
+......
+
+<p><a href="mailto:a.b-c_d@a.b">a.b-c_d@a.b</a></p>
+<p><a href="mailto:a.b-c_d@a.b">a.b-c_d@a.b</a>.</p>
+<p>a.b-c_d@a.b-</p>
+<p>a.b-c_d@a.b_</p>
diff --git a/crates/gfm/tests/fixtures/spec_001.md b/crates/gfm/tests/fixtures/spec_001.md
new file mode 100644
index 0000000..1097a5b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_001.md
@@ -0,0 +1,9 @@
+Example 1
+......
+
+	foo	baz		bim
+
+......
+
+<pre><code>foo	baz		bim
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_002.md b/crates/gfm/tests/fixtures/spec_002.md
new file mode 100644
index 0000000..fc23f53
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_002.md
@@ -0,0 +1,9 @@
+Example 2
+......
+
+  	foo	baz		bim
+
+......
+
+<pre><code>foo	baz		bim
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_003.md b/crates/gfm/tests/fixtures/spec_003.md
new file mode 100644
index 0000000..1cda623
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_003.md
@@ -0,0 +1,11 @@
+Example 3
+......
+
+    a	a
+    ὐ	a
+
+......
+
+<pre><code>a	a
+ὐ	a
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_004.md b/crates/gfm/tests/fixtures/spec_004.md
new file mode 100644
index 0000000..723800c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_004.md
@@ -0,0 +1,15 @@
+Example 4
+......
+
+  - foo
+
+	bar
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_005.md b/crates/gfm/tests/fixtures/spec_005.md
new file mode 100644
index 0000000..6548895
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_005.md
@@ -0,0 +1,16 @@
+Example 5
+......
+
+- foo
+
+		bar
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<pre><code>  bar
+</code></pre>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_006.md b/crates/gfm/tests/fixtures/spec_006.md
new file mode 100644
index 0000000..be6f493
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_006.md
@@ -0,0 +1,11 @@
+Example 6
+......
+
+>		foo
+
+......
+
+<blockquote>
+<pre><code>  foo
+</code></pre>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_007.md b/crates/gfm/tests/fixtures/spec_007.md
new file mode 100644
index 0000000..88f5601
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_007.md
@@ -0,0 +1,13 @@
+Example 7
+......
+
+-		foo
+
+......
+
+<ul>
+<li>
+<pre><code>  foo
+</code></pre>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_008.md b/crates/gfm/tests/fixtures/spec_008.md
new file mode 100644
index 0000000..02797ed
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_008.md
@@ -0,0 +1,11 @@
+Example 8
+......
+
+    foo
+	bar
+
+......
+
+<pre><code>foo
+bar
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_009.md b/crates/gfm/tests/fixtures/spec_009.md
new file mode 100644
index 0000000..b1f614c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_009.md
@@ -0,0 +1,20 @@
+Example 9
+......
+
+ - foo
+   - bar
+	 - baz
+
+......
+
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_010.md b/crates/gfm/tests/fixtures/spec_010.md
new file mode 100644
index 0000000..c5fbc3d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_010.md
@@ -0,0 +1,8 @@
+Example 10
+......
+
+#	Foo
+
+......
+
+<h1>Foo</h1>
diff --git a/crates/gfm/tests/fixtures/spec_011.md b/crates/gfm/tests/fixtures/spec_011.md
new file mode 100644
index 0000000..aecef9b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_011.md
@@ -0,0 +1,8 @@
+Example 11
+......
+
+*	*	*	
+
+......
+
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_012.md b/crates/gfm/tests/fixtures/spec_012.md
new file mode 100644
index 0000000..6341fa2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_012.md
@@ -0,0 +1,12 @@
+Example 12
+......
+
+- `one
+- two`
+
+......
+
+<ul>
+<li>`one</li>
+<li>two`</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_013.md b/crates/gfm/tests/fixtures/spec_013.md
new file mode 100644
index 0000000..525d944
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_013.md
@@ -0,0 +1,12 @@
+Example 13
+......
+
+***
+---
+___
+
+......
+
+<hr />
+<hr />
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_014.md b/crates/gfm/tests/fixtures/spec_014.md
new file mode 100644
index 0000000..28c85fe
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_014.md
@@ -0,0 +1,8 @@
+Example 14
+......
+
++++
+
+......
+
+<p>+++</p>
diff --git a/crates/gfm/tests/fixtures/spec_015.md b/crates/gfm/tests/fixtures/spec_015.md
new file mode 100644
index 0000000..6605206
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_015.md
@@ -0,0 +1,8 @@
+Example 15
+......
+
+===
+
+......
+
+<p>===</p>
diff --git a/crates/gfm/tests/fixtures/spec_016.md b/crates/gfm/tests/fixtures/spec_016.md
new file mode 100644
index 0000000..8da3ce8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_016.md
@@ -0,0 +1,12 @@
+Example 16
+......
+
+--
+**
+__
+
+......
+
+<p>--
+**
+__</p>
diff --git a/crates/gfm/tests/fixtures/spec_017.md b/crates/gfm/tests/fixtures/spec_017.md
new file mode 100644
index 0000000..b94660b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_017.md
@@ -0,0 +1,12 @@
+Example 17
+......
+
+ ***
+  ***
+   ***
+
+......
+
+<hr />
+<hr />
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_018.md b/crates/gfm/tests/fixtures/spec_018.md
new file mode 100644
index 0000000..805376e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_018.md
@@ -0,0 +1,9 @@
+Example 18
+......
+
+    ***
+
+......
+
+<pre><code>***
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_019.md b/crates/gfm/tests/fixtures/spec_019.md
new file mode 100644
index 0000000..1a49419
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_019.md
@@ -0,0 +1,10 @@
+Example 19
+......
+
+Foo
+    ***
+
+......
+
+<p>Foo
+***</p>
diff --git a/crates/gfm/tests/fixtures/spec_020.md b/crates/gfm/tests/fixtures/spec_020.md
new file mode 100644
index 0000000..b0d2b4a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_020.md
@@ -0,0 +1,8 @@
+Example 20
+......
+
+_____________________________________
+
+......
+
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_021.md b/crates/gfm/tests/fixtures/spec_021.md
new file mode 100644
index 0000000..baf5369
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_021.md
@@ -0,0 +1,8 @@
+Example 21
+......
+
+ - - -
+
+......
+
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_022.md b/crates/gfm/tests/fixtures/spec_022.md
new file mode 100644
index 0000000..e1e007a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_022.md
@@ -0,0 +1,8 @@
+Example 22
+......
+
+ **  * ** * ** * **
+
+......
+
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_023.md b/crates/gfm/tests/fixtures/spec_023.md
new file mode 100644
index 0000000..3fc030e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_023.md
@@ -0,0 +1,8 @@
+Example 23
+......
+
+-     -      -      -
+
+......
+
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_024.md b/crates/gfm/tests/fixtures/spec_024.md
new file mode 100644
index 0000000..716e7ad
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_024.md
@@ -0,0 +1,8 @@
+Example 24
+......
+
+- - - -    
+
+......
+
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_025.md b/crates/gfm/tests/fixtures/spec_025.md
new file mode 100644
index 0000000..6deccb8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_025.md
@@ -0,0 +1,14 @@
+Example 25
+......
+
+_ _ _ _ a
+
+a------
+
+---a---
+
+......
+
+<p>_ _ _ _ a</p>
+<p>a------</p>
+<p>---a---</p>
diff --git a/crates/gfm/tests/fixtures/spec_026.md b/crates/gfm/tests/fixtures/spec_026.md
new file mode 100644
index 0000000..dc62890
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_026.md
@@ -0,0 +1,8 @@
+Example 26
+......
+
+ *-*
+
+......
+
+<p><em>-</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_027.md b/crates/gfm/tests/fixtures/spec_027.md
new file mode 100644
index 0000000..bdeaf70
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_027.md
@@ -0,0 +1,16 @@
+Example 27
+......
+
+- foo
+***
+- bar
+
+......
+
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+<ul>
+<li>bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_028.md b/crates/gfm/tests/fixtures/spec_028.md
new file mode 100644
index 0000000..5d5550f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_028.md
@@ -0,0 +1,12 @@
+Example 28
+......
+
+Foo
+***
+bar
+
+......
+
+<p>Foo</p>
+<hr />
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_029.md b/crates/gfm/tests/fixtures/spec_029.md
new file mode 100644
index 0000000..a980267
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_029.md
@@ -0,0 +1,11 @@
+Example 29
+......
+
+Foo
+---
+bar
+
+......
+
+<h2>Foo</h2>
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_030.md b/crates/gfm/tests/fixtures/spec_030.md
new file mode 100644
index 0000000..a1f09cb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_030.md
@@ -0,0 +1,16 @@
+Example 30
+......
+
+* Foo
+* * *
+* Bar
+
+......
+
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+<ul>
+<li>Bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_031.md b/crates/gfm/tests/fixtures/spec_031.md
new file mode 100644
index 0000000..3585917
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_031.md
@@ -0,0 +1,14 @@
+Example 31
+......
+
+- Foo
+- * * *
+
+......
+
+<ul>
+<li>Foo</li>
+<li>
+<hr />
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_032.md b/crates/gfm/tests/fixtures/spec_032.md
new file mode 100644
index 0000000..1aa1f5e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_032.md
@@ -0,0 +1,18 @@
+Example 32
+......
+
+# foo
+## foo
+### foo
+#### foo
+##### foo
+###### foo
+
+......
+
+<h1>foo</h1>
+<h2>foo</h2>
+<h3>foo</h3>
+<h4>foo</h4>
+<h5>foo</h5>
+<h6>foo</h6>
diff --git a/crates/gfm/tests/fixtures/spec_033.md b/crates/gfm/tests/fixtures/spec_033.md
new file mode 100644
index 0000000..05957a8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_033.md
@@ -0,0 +1,8 @@
+Example 33
+......
+
+####### foo
+
+......
+
+<p>####### foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_034.md b/crates/gfm/tests/fixtures/spec_034.md
new file mode 100644
index 0000000..ba53595
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_034.md
@@ -0,0 +1,11 @@
+Example 34
+......
+
+#5 bolt
+
+#hashtag
+
+......
+
+<p>#5 bolt</p>
+<p>#hashtag</p>
diff --git a/crates/gfm/tests/fixtures/spec_035.md b/crates/gfm/tests/fixtures/spec_035.md
new file mode 100644
index 0000000..725f46d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_035.md
@@ -0,0 +1,8 @@
+Example 35
+......
+
+\## foo
+
+......
+
+<p>## foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_036.md b/crates/gfm/tests/fixtures/spec_036.md
new file mode 100644
index 0000000..b85c232
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_036.md
@@ -0,0 +1,8 @@
+Example 36
+......
+
+# foo *bar* \*baz\*
+
+......
+
+<h1>foo <em>bar</em> *baz*</h1>
diff --git a/crates/gfm/tests/fixtures/spec_037.md b/crates/gfm/tests/fixtures/spec_037.md
new file mode 100644
index 0000000..e54764f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_037.md
@@ -0,0 +1,8 @@
+Example 37
+......
+
+#                  foo                     
+
+......
+
+<h1>foo</h1>
diff --git a/crates/gfm/tests/fixtures/spec_038.md b/crates/gfm/tests/fixtures/spec_038.md
new file mode 100644
index 0000000..9ea381c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_038.md
@@ -0,0 +1,12 @@
+Example 38
+......
+
+ ### foo
+  ## foo
+   # foo
+
+......
+
+<h3>foo</h3>
+<h2>foo</h2>
+<h1>foo</h1>
diff --git a/crates/gfm/tests/fixtures/spec_039.md b/crates/gfm/tests/fixtures/spec_039.md
new file mode 100644
index 0000000..0880969
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_039.md
@@ -0,0 +1,9 @@
+Example 39
+......
+
+    # foo
+
+......
+
+<pre><code># foo
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_040.md b/crates/gfm/tests/fixtures/spec_040.md
new file mode 100644
index 0000000..2a27bc1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_040.md
@@ -0,0 +1,10 @@
+Example 40
+......
+
+foo
+    # bar
+
+......
+
+<p>foo
+# bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_041.md b/crates/gfm/tests/fixtures/spec_041.md
new file mode 100644
index 0000000..4caf3ad
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_041.md
@@ -0,0 +1,10 @@
+Example 41
+......
+
+## foo ##
+  ###   bar    ###
+
+......
+
+<h2>foo</h2>
+<h3>bar</h3>
diff --git a/crates/gfm/tests/fixtures/spec_042.md b/crates/gfm/tests/fixtures/spec_042.md
new file mode 100644
index 0000000..0839e14
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_042.md
@@ -0,0 +1,10 @@
+Example 42
+......
+
+# foo ##################################
+##### foo ##
+
+......
+
+<h1>foo</h1>
+<h5>foo</h5>
diff --git a/crates/gfm/tests/fixtures/spec_043.md b/crates/gfm/tests/fixtures/spec_043.md
new file mode 100644
index 0000000..139a409
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_043.md
@@ -0,0 +1,8 @@
+Example 43
+......
+
+### foo ###     
+
+......
+
+<h3>foo</h3>
diff --git a/crates/gfm/tests/fixtures/spec_044.md b/crates/gfm/tests/fixtures/spec_044.md
new file mode 100644
index 0000000..fa2dd7f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_044.md
@@ -0,0 +1,8 @@
+Example 44
+......
+
+### foo ### b
+
+......
+
+<h3>foo ### b</h3>
diff --git a/crates/gfm/tests/fixtures/spec_045.md b/crates/gfm/tests/fixtures/spec_045.md
new file mode 100644
index 0000000..7319a1d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_045.md
@@ -0,0 +1,8 @@
+Example 45
+......
+
+# foo#
+
+......
+
+<h1>foo#</h1>
diff --git a/crates/gfm/tests/fixtures/spec_046.md b/crates/gfm/tests/fixtures/spec_046.md
new file mode 100644
index 0000000..7045572
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_046.md
@@ -0,0 +1,12 @@
+Example 46
+......
+
+### foo \###
+## foo #\##
+# foo \#
+
+......
+
+<h3>foo ###</h3>
+<h2>foo ###</h2>
+<h1>foo #</h1>
diff --git a/crates/gfm/tests/fixtures/spec_047.md b/crates/gfm/tests/fixtures/spec_047.md
new file mode 100644
index 0000000..e051892
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_047.md
@@ -0,0 +1,12 @@
+Example 47
+......
+
+****
+## foo
+****
+
+......
+
+<hr />
+<h2>foo</h2>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_048.md b/crates/gfm/tests/fixtures/spec_048.md
new file mode 100644
index 0000000..69a6d52
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_048.md
@@ -0,0 +1,12 @@
+Example 48
+......
+
+Foo bar
+# baz
+Bar foo
+
+......
+
+<p>Foo bar</p>
+<h1>baz</h1>
+<p>Bar foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_049.md b/crates/gfm/tests/fixtures/spec_049.md
new file mode 100644
index 0000000..62e0007
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_049.md
@@ -0,0 +1,12 @@
+Example 49
+......
+
+## 
+#
+### ###
+
+......
+
+<h2></h2>
+<h1></h1>
+<h3></h3>
diff --git a/crates/gfm/tests/fixtures/spec_050.md b/crates/gfm/tests/fixtures/spec_050.md
new file mode 100644
index 0000000..218a1fd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_050.md
@@ -0,0 +1,13 @@
+Example 50
+......
+
+Foo *bar*
+=========
+
+Foo *bar*
+---------
+
+......
+
+<h1>Foo <em>bar</em></h1>
+<h2>Foo <em>bar</em></h2>
diff --git a/crates/gfm/tests/fixtures/spec_051.md b/crates/gfm/tests/fixtures/spec_051.md
new file mode 100644
index 0000000..07bbf8c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_051.md
@@ -0,0 +1,11 @@
+Example 51
+......
+
+Foo *bar
+baz*
+====
+
+......
+
+<h1>Foo <em>bar
+baz</em></h1>
diff --git a/crates/gfm/tests/fixtures/spec_052.md b/crates/gfm/tests/fixtures/spec_052.md
new file mode 100644
index 0000000..d55d058
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_052.md
@@ -0,0 +1,11 @@
+Example 52
+......
+
+  Foo *bar
+baz*	
+====
+
+......
+
+<h1>Foo <em>bar
+baz</em></h1>
diff --git a/crates/gfm/tests/fixtures/spec_053.md b/crates/gfm/tests/fixtures/spec_053.md
new file mode 100644
index 0000000..ac01650
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_053.md
@@ -0,0 +1,13 @@
+Example 53
+......
+
+Foo
+-------------------------
+
+Foo
+=
+
+......
+
+<h2>Foo</h2>
+<h1>Foo</h1>
diff --git a/crates/gfm/tests/fixtures/spec_054.md b/crates/gfm/tests/fixtures/spec_054.md
new file mode 100644
index 0000000..afc281c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_054.md
@@ -0,0 +1,17 @@
+Example 54
+......
+
+   Foo
+---
+
+  Foo
+-----
+
+  Foo
+  ===
+
+......
+
+<h2>Foo</h2>
+<h2>Foo</h2>
+<h1>Foo</h1>
diff --git a/crates/gfm/tests/fixtures/spec_055.md b/crates/gfm/tests/fixtures/spec_055.md
new file mode 100644
index 0000000..02228e7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_055.md
@@ -0,0 +1,17 @@
+Example 55
+......
+
+    Foo
+    ---
+
+    Foo
+---
+
+......
+
+<pre><code>Foo
+---
+
+Foo
+</code></pre>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_056.md b/crates/gfm/tests/fixtures/spec_056.md
new file mode 100644
index 0000000..61c73f9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_056.md
@@ -0,0 +1,9 @@
+Example 56
+......
+
+Foo
+   ----      
+
+......
+
+<h2>Foo</h2>
diff --git a/crates/gfm/tests/fixtures/spec_057.md b/crates/gfm/tests/fixtures/spec_057.md
new file mode 100644
index 0000000..75903b0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_057.md
@@ -0,0 +1,10 @@
+Example 57
+......
+
+Foo
+    ---
+
+......
+
+<p>Foo
+---</p>
diff --git a/crates/gfm/tests/fixtures/spec_058.md b/crates/gfm/tests/fixtures/spec_058.md
new file mode 100644
index 0000000..c6dee47
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_058.md
@@ -0,0 +1,15 @@
+Example 58
+......
+
+Foo
+= =
+
+Foo
+--- -
+
+......
+
+<p>Foo
+= =</p>
+<p>Foo</p>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_059.md b/crates/gfm/tests/fixtures/spec_059.md
new file mode 100644
index 0000000..d35e813
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_059.md
@@ -0,0 +1,9 @@
+Example 59
+......
+
+Foo  
+-----
+
+......
+
+<h2>Foo</h2>
diff --git a/crates/gfm/tests/fixtures/spec_060.md b/crates/gfm/tests/fixtures/spec_060.md
new file mode 100644
index 0000000..c52f733
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_060.md
@@ -0,0 +1,9 @@
+Example 60
+......
+
+Foo\
+----
+
+......
+
+<h2>Foo\</h2>
diff --git a/crates/gfm/tests/fixtures/spec_061.md b/crates/gfm/tests/fixtures/spec_061.md
new file mode 100644
index 0000000..1c6349e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_061.md
@@ -0,0 +1,17 @@
+Example 61
+......
+
+`Foo
+----
+`
+
+<a title="a lot
+---
+of dashes"/>
+
+......
+
+<h2>`Foo</h2>
+<p>`</p>
+<h2>&lt;a title=&quot;a lot</h2>
+<p>of dashes&quot;/&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_062.md b/crates/gfm/tests/fixtures/spec_062.md
new file mode 100644
index 0000000..5a8d309
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_062.md
@@ -0,0 +1,12 @@
+Example 62
+......
+
+> Foo
+---
+
+......
+
+<blockquote>
+<p>Foo</p>
+</blockquote>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_063.md b/crates/gfm/tests/fixtures/spec_063.md
new file mode 100644
index 0000000..cae7c97
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_063.md
@@ -0,0 +1,14 @@
+Example 63
+......
+
+> foo
+bar
+===
+
+......
+
+<blockquote>
+<p>foo
+bar
+===</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_064.md b/crates/gfm/tests/fixtures/spec_064.md
new file mode 100644
index 0000000..e6e17eb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_064.md
@@ -0,0 +1,12 @@
+Example 64
+......
+
+- Foo
+---
+
+......
+
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_065.md b/crates/gfm/tests/fixtures/spec_065.md
new file mode 100644
index 0000000..c670a1c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_065.md
@@ -0,0 +1,11 @@
+Example 65
+......
+
+Foo
+Bar
+---
+
+......
+
+<h2>Foo
+Bar</h2>
diff --git a/crates/gfm/tests/fixtures/spec_066.md b/crates/gfm/tests/fixtures/spec_066.md
new file mode 100644
index 0000000..77cd42a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_066.md
@@ -0,0 +1,16 @@
+Example 66
+......
+
+---
+Foo
+---
+Bar
+---
+Baz
+
+......
+
+<hr />
+<h2>Foo</h2>
+<h2>Bar</h2>
+<p>Baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_067.md b/crates/gfm/tests/fixtures/spec_067.md
new file mode 100644
index 0000000..3304fcf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_067.md
@@ -0,0 +1,9 @@
+Example 67
+......
+
+
+====
+
+......
+
+<p>====</p>
diff --git a/crates/gfm/tests/fixtures/spec_068.md b/crates/gfm/tests/fixtures/spec_068.md
new file mode 100644
index 0000000..f85efe9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_068.md
@@ -0,0 +1,10 @@
+Example 68
+......
+
+---
+---
+
+......
+
+<hr />
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_069.md b/crates/gfm/tests/fixtures/spec_069.md
new file mode 100644
index 0000000..299dd5e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_069.md
@@ -0,0 +1,12 @@
+Example 69
+......
+
+- foo
+-----
+
+......
+
+<ul>
+<li>foo</li>
+</ul>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_070.md b/crates/gfm/tests/fixtures/spec_070.md
new file mode 100644
index 0000000..4185a17
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_070.md
@@ -0,0 +1,11 @@
+Example 70
+......
+
+    foo
+---
+
+......
+
+<pre><code>foo
+</code></pre>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_071.md b/crates/gfm/tests/fixtures/spec_071.md
new file mode 100644
index 0000000..bfeadae
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_071.md
@@ -0,0 +1,12 @@
+Example 71
+......
+
+> foo
+-----
+
+......
+
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_072.md b/crates/gfm/tests/fixtures/spec_072.md
new file mode 100644
index 0000000..b34c912
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_072.md
@@ -0,0 +1,9 @@
+Example 72
+......
+
+\> foo
+------
+
+......
+
+<h2>&gt; foo</h2>
diff --git a/crates/gfm/tests/fixtures/spec_073.md b/crates/gfm/tests/fixtures/spec_073.md
new file mode 100644
index 0000000..8550a26
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_073.md
@@ -0,0 +1,14 @@
+Example 73
+......
+
+Foo
+
+bar
+---
+baz
+
+......
+
+<p>Foo</p>
+<h2>bar</h2>
+<p>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_074.md b/crates/gfm/tests/fixtures/spec_074.md
new file mode 100644
index 0000000..7332598
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_074.md
@@ -0,0 +1,16 @@
+Example 74
+......
+
+Foo
+bar
+
+---
+
+baz
+
+......
+
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_075.md b/crates/gfm/tests/fixtures/spec_075.md
new file mode 100644
index 0000000..c7c83cf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_075.md
@@ -0,0 +1,14 @@
+Example 75
+......
+
+Foo
+bar
+* * *
+baz
+
+......
+
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_076.md b/crates/gfm/tests/fixtures/spec_076.md
new file mode 100644
index 0000000..0cc6886
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_076.md
@@ -0,0 +1,14 @@
+Example 76
+......
+
+Foo
+bar
+\---
+baz
+
+......
+
+<p>Foo
+bar
+---
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_077.md b/crates/gfm/tests/fixtures/spec_077.md
new file mode 100644
index 0000000..a354de3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_077.md
@@ -0,0 +1,11 @@
+Example 77
+......
+
+    a simple
+      indented code block
+
+......
+
+<pre><code>a simple
+  indented code block
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_078.md b/crates/gfm/tests/fixtures/spec_078.md
new file mode 100644
index 0000000..84bf5cd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_078.md
@@ -0,0 +1,15 @@
+Example 78
+......
+
+  - foo
+
+    bar
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_079.md b/crates/gfm/tests/fixtures/spec_079.md
new file mode 100644
index 0000000..840c9c8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_079.md
@@ -0,0 +1,17 @@
+Example 79
+......
+
+1.  foo
+
+    - bar
+
+......
+
+<ol>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_080.md b/crates/gfm/tests/fixtures/spec_080.md
new file mode 100644
index 0000000..46703cc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_080.md
@@ -0,0 +1,15 @@
+Example 80
+......
+
+    <a/>
+    *hi*
+
+    - one
+
+......
+
+<pre><code>&lt;a/&gt;
+*hi*
+
+- one
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_081.md b/crates/gfm/tests/fixtures/spec_081.md
new file mode 100644
index 0000000..3d41fe9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_081.md
@@ -0,0 +1,21 @@
+Example 81
+......
+
+    chunk1
+
+    chunk2
+  
+ 
+ 
+    chunk3
+
+......
+
+<pre><code>chunk1
+
+chunk2
+
+
+
+chunk3
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_082.md b/crates/gfm/tests/fixtures/spec_082.md
new file mode 100644
index 0000000..14b7b85
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_082.md
@@ -0,0 +1,13 @@
+Example 82
+......
+
+    chunk1
+      
+      chunk2
+
+......
+
+<pre><code>chunk1
+  
+  chunk2
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_083.md b/crates/gfm/tests/fixtures/spec_083.md
new file mode 100644
index 0000000..b3a9fa5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_083.md
@@ -0,0 +1,11 @@
+Example 83
+......
+
+Foo
+    bar
+
+
+......
+
+<p>Foo
+bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_084.md b/crates/gfm/tests/fixtures/spec_084.md
new file mode 100644
index 0000000..aace74a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_084.md
@@ -0,0 +1,11 @@
+Example 84
+......
+
+    foo
+bar
+
+......
+
+<pre><code>foo
+</code></pre>
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_085.md b/crates/gfm/tests/fixtures/spec_085.md
new file mode 100644
index 0000000..3e723a4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_085.md
@@ -0,0 +1,19 @@
+Example 85
+......
+
+# Heading
+    foo
+Heading
+------
+    foo
+----
+
+......
+
+<h1>Heading</h1>
+<pre><code>foo
+</code></pre>
+<h2>Heading</h2>
+<pre><code>foo
+</code></pre>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_086.md b/crates/gfm/tests/fixtures/spec_086.md
new file mode 100644
index 0000000..172983f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_086.md
@@ -0,0 +1,11 @@
+Example 86
+......
+
+        foo
+    bar
+
+......
+
+<pre><code>    foo
+bar
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_087.md b/crates/gfm/tests/fixtures/spec_087.md
new file mode 100644
index 0000000..345f61a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_087.md
@@ -0,0 +1,13 @@
+Example 87
+......
+
+
+    
+    foo
+    
+
+
+......
+
+<pre><code>foo
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_088.md b/crates/gfm/tests/fixtures/spec_088.md
new file mode 100644
index 0000000..cbfea3b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_088.md
@@ -0,0 +1,9 @@
+Example 88
+......
+
+    foo  
+
+......
+
+<pre><code>foo  
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_089.md b/crates/gfm/tests/fixtures/spec_089.md
new file mode 100644
index 0000000..e4ef237
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_089.md
@@ -0,0 +1,13 @@
+Example 89
+......
+
+```
+<
+ >
+```
+
+......
+
+<pre><code>&lt;
+ &gt;
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_090.md b/crates/gfm/tests/fixtures/spec_090.md
new file mode 100644
index 0000000..e1c59ff
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_090.md
@@ -0,0 +1,13 @@
+Example 90
+......
+
+~~~
+<
+ >
+~~~
+
+......
+
+<pre><code>&lt;
+ &gt;
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_091.md b/crates/gfm/tests/fixtures/spec_091.md
new file mode 100644
index 0000000..09a78de
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_091.md
@@ -0,0 +1,10 @@
+Example 91
+......
+
+``
+foo
+``
+
+......
+
+<p><code>foo</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_092.md b/crates/gfm/tests/fixtures/spec_092.md
new file mode 100644
index 0000000..c9f367f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_092.md
@@ -0,0 +1,13 @@
+Example 92
+......
+
+```
+aaa
+~~~
+```
+
+......
+
+<pre><code>aaa
+~~~
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_093.md b/crates/gfm/tests/fixtures/spec_093.md
new file mode 100644
index 0000000..35187ed
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_093.md
@@ -0,0 +1,13 @@
+Example 93
+......
+
+~~~
+aaa
+```
+~~~
+
+......
+
+<pre><code>aaa
+```
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_094.md b/crates/gfm/tests/fixtures/spec_094.md
new file mode 100644
index 0000000..6fa9a31
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_094.md
@@ -0,0 +1,13 @@
+Example 94
+......
+
+````
+aaa
+```
+``````
+
+......
+
+<pre><code>aaa
+```
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_095.md b/crates/gfm/tests/fixtures/spec_095.md
new file mode 100644
index 0000000..e9a4003
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_095.md
@@ -0,0 +1,13 @@
+Example 95
+......
+
+~~~~
+aaa
+~~~
+~~~~
+
+......
+
+<pre><code>aaa
+~~~
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_096.md b/crates/gfm/tests/fixtures/spec_096.md
new file mode 100644
index 0000000..d989361
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_096.md
@@ -0,0 +1,8 @@
+Example 96
+......
+
+```
+
+......
+
+<pre><code></code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_097.md b/crates/gfm/tests/fixtures/spec_097.md
new file mode 100644
index 0000000..8661fc0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_097.md
@@ -0,0 +1,14 @@
+Example 97
+......
+
+`````
+
+```
+aaa
+
+......
+
+<pre><code>
+```
+aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_098.md b/crates/gfm/tests/fixtures/spec_098.md
new file mode 100644
index 0000000..19e0266
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_098.md
@@ -0,0 +1,15 @@
+Example 98
+......
+
+> ```
+> aaa
+
+bbb
+
+......
+
+<blockquote>
+<pre><code>aaa
+</code></pre>
+</blockquote>
+<p>bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_099.md b/crates/gfm/tests/fixtures/spec_099.md
new file mode 100644
index 0000000..eb9c8d5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_099.md
@@ -0,0 +1,13 @@
+Example 99
+......
+
+```
+
+  
+```
+
+......
+
+<pre><code>
+  
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_100.md b/crates/gfm/tests/fixtures/spec_100.md
new file mode 100644
index 0000000..9f0edc7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_100.md
@@ -0,0 +1,9 @@
+Example 100
+......
+
+```
+```
+
+......
+
+<pre><code></code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_101.md b/crates/gfm/tests/fixtures/spec_101.md
new file mode 100644
index 0000000..15d80ea
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_101.md
@@ -0,0 +1,13 @@
+Example 101
+......
+
+ ```
+ aaa
+aaa
+```
+
+......
+
+<pre><code>aaa
+aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_102.md b/crates/gfm/tests/fixtures/spec_102.md
new file mode 100644
index 0000000..a0a61b6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_102.md
@@ -0,0 +1,15 @@
+Example 102
+......
+
+  ```
+aaa
+  aaa
+aaa
+  ```
+
+......
+
+<pre><code>aaa
+aaa
+aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_103.md b/crates/gfm/tests/fixtures/spec_103.md
new file mode 100644
index 0000000..251ec50
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_103.md
@@ -0,0 +1,15 @@
+Example 103
+......
+
+   ```
+   aaa
+    aaa
+  aaa
+   ```
+
+......
+
+<pre><code>aaa
+ aaa
+aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_104.md b/crates/gfm/tests/fixtures/spec_104.md
new file mode 100644
index 0000000..c0dbd77
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_104.md
@@ -0,0 +1,13 @@
+Example 104
+......
+
+    ```
+    aaa
+    ```
+
+......
+
+<pre><code>```
+aaa
+```
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_105.md b/crates/gfm/tests/fixtures/spec_105.md
new file mode 100644
index 0000000..6d4619c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_105.md
@@ -0,0 +1,11 @@
+Example 105
+......
+
+```
+aaa
+  ```
+
+......
+
+<pre><code>aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_106.md b/crates/gfm/tests/fixtures/spec_106.md
new file mode 100644
index 0000000..4c51825
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_106.md
@@ -0,0 +1,11 @@
+Example 106
+......
+
+   ```
+aaa
+  ```
+
+......
+
+<pre><code>aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_107.md b/crates/gfm/tests/fixtures/spec_107.md
new file mode 100644
index 0000000..0bd1aa9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_107.md
@@ -0,0 +1,12 @@
+Example 107
+......
+
+```
+aaa
+    ```
+
+......
+
+<pre><code>aaa
+    ```
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_108.md b/crates/gfm/tests/fixtures/spec_108.md
new file mode 100644
index 0000000..df60050
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_108.md
@@ -0,0 +1,10 @@
+Example 108
+......
+
+``` ```
+aaa
+
+......
+
+<p><code> </code>
+aaa</p>
diff --git a/crates/gfm/tests/fixtures/spec_109.md b/crates/gfm/tests/fixtures/spec_109.md
new file mode 100644
index 0000000..be3c546
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_109.md
@@ -0,0 +1,12 @@
+Example 109
+......
+
+~~~~~~
+aaa
+~~~ ~~
+
+......
+
+<pre><code>aaa
+~~~ ~~
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_110.md b/crates/gfm/tests/fixtures/spec_110.md
new file mode 100644
index 0000000..8adbd97
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_110.md
@@ -0,0 +1,15 @@
+Example 110
+......
+
+foo
+```
+bar
+```
+baz
+
+......
+
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_111.md b/crates/gfm/tests/fixtures/spec_111.md
new file mode 100644
index 0000000..1ee7bba
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_111.md
@@ -0,0 +1,16 @@
+Example 111
+......
+
+foo
+---
+~~~
+bar
+~~~
+# baz
+
+......
+
+<h2>foo</h2>
+<pre><code>bar
+</code></pre>
+<h1>baz</h1>
diff --git a/crates/gfm/tests/fixtures/spec_112.md b/crates/gfm/tests/fixtures/spec_112.md
new file mode 100644
index 0000000..d12fc8e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_112.md
@@ -0,0 +1,15 @@
+Example 112
+......
+
+```ruby
+def foo(x)
+  return 3
+end
+```
+
+......
+
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_113.md b/crates/gfm/tests/fixtures/spec_113.md
new file mode 100644
index 0000000..1b8c5a7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_113.md
@@ -0,0 +1,15 @@
+Example 113
+......
+
+~~~~    ruby startline=3 $%@#$
+def foo(x)
+  return 3
+end
+~~~~~~~
+
+......
+
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_114.md b/crates/gfm/tests/fixtures/spec_114.md
new file mode 100644
index 0000000..948133e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_114.md
@@ -0,0 +1,9 @@
+Example 114
+......
+
+````;
+````
+
+......
+
+<pre><code class="language-;"></code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_115.md b/crates/gfm/tests/fixtures/spec_115.md
new file mode 100644
index 0000000..6e68ce5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_115.md
@@ -0,0 +1,10 @@
+Example 115
+......
+
+``` aa ```
+foo
+
+......
+
+<p><code>aa</code>
+foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_116.md b/crates/gfm/tests/fixtures/spec_116.md
new file mode 100644
index 0000000..1b58d44
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_116.md
@@ -0,0 +1,11 @@
+Example 116
+......
+
+~~~ aa ``` ~~~
+foo
+~~~
+
+......
+
+<pre><code class="language-aa">foo
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_117.md b/crates/gfm/tests/fixtures/spec_117.md
new file mode 100644
index 0000000..a2bd3e3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_117.md
@@ -0,0 +1,11 @@
+Example 117
+......
+
+```
+``` aaa
+```
+
+......
+
+<pre><code>``` aaa
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_118.md b/crates/gfm/tests/fixtures/spec_118.md
new file mode 100644
index 0000000..bb25df2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_118.md
@@ -0,0 +1,19 @@
+Example 118
+......
+
+<table><tr><td>
+<pre>
+**Hello**,
+
+_world_.
+</pre>
+</td></tr></table>
+
+......
+
+<table><tr><td>
+<pre>
+**Hello**,
+<p><em>world</em>.
+</pre></p>
+</td></tr></table>
diff --git a/crates/gfm/tests/fixtures/spec_119.md b/crates/gfm/tests/fixtures/spec_119.md
new file mode 100644
index 0000000..0376a18
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_119.md
@@ -0,0 +1,23 @@
+Example 119
+......
+
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+
+okay.
+
+......
+
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+<p>okay.</p>
diff --git a/crates/gfm/tests/fixtures/spec_120.md b/crates/gfm/tests/fixtures/spec_120.md
new file mode 100644
index 0000000..8996d70
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_120.md
@@ -0,0 +1,12 @@
+Example 120
+......
+
+ <div>
+  *hello*
+         <foo><a>
+
+......
+
+ <div>
+  *hello*
+         <foo><a>
diff --git a/crates/gfm/tests/fixtures/spec_121.md b/crates/gfm/tests/fixtures/spec_121.md
new file mode 100644
index 0000000..9055763
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_121.md
@@ -0,0 +1,10 @@
+Example 121
+......
+
+</div>
+*foo*
+
+......
+
+</div>
+*foo*
diff --git a/crates/gfm/tests/fixtures/spec_122.md b/crates/gfm/tests/fixtures/spec_122.md
new file mode 100644
index 0000000..9b3c6a4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_122.md
@@ -0,0 +1,14 @@
+Example 122
+......
+
+<DIV CLASS="foo">
+
+*Markdown*
+
+</DIV>
+
+......
+
+<DIV CLASS="foo">
+<p><em>Markdown</em></p>
+</DIV>
diff --git a/crates/gfm/tests/fixtures/spec_123.md b/crates/gfm/tests/fixtures/spec_123.md
new file mode 100644
index 0000000..b225f4b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_123.md
@@ -0,0 +1,12 @@
+Example 123
+......
+
+<div id="foo"
+  class="bar">
+</div>
+
+......
+
+<div id="foo"
+  class="bar">
+</div>
diff --git a/crates/gfm/tests/fixtures/spec_124.md b/crates/gfm/tests/fixtures/spec_124.md
new file mode 100644
index 0000000..bdc5d64
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_124.md
@@ -0,0 +1,12 @@
+Example 124
+......
+
+<div id="foo" class="bar
+  baz">
+</div>
+
+......
+
+<div id="foo" class="bar
+  baz">
+</div>
diff --git a/crates/gfm/tests/fixtures/spec_125.md b/crates/gfm/tests/fixtures/spec_125.md
new file mode 100644
index 0000000..c39427e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_125.md
@@ -0,0 +1,13 @@
+Example 125
+......
+
+<div>
+*foo*
+
+*bar*
+
+......
+
+<div>
+*foo*
+<p><em>bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_126.md b/crates/gfm/tests/fixtures/spec_126.md
new file mode 100644
index 0000000..41f3c47
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_126.md
@@ -0,0 +1,10 @@
+Example 126
+......
+
+<div id="foo"
+*hi*
+
+......
+
+<div id="foo"
+*hi*
diff --git a/crates/gfm/tests/fixtures/spec_127.md b/crates/gfm/tests/fixtures/spec_127.md
new file mode 100644
index 0000000..a46ad93
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_127.md
@@ -0,0 +1,10 @@
+Example 127
+......
+
+<div class
+foo
+
+......
+
+<div class
+foo
diff --git a/crates/gfm/tests/fixtures/spec_128.md b/crates/gfm/tests/fixtures/spec_128.md
new file mode 100644
index 0000000..f6cc232
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_128.md
@@ -0,0 +1,10 @@
+Example 128
+......
+
+<div *???-&&&-<---
+*foo*
+
+......
+
+<div *???-&&&-<---
+*foo*
diff --git a/crates/gfm/tests/fixtures/spec_129.md b/crates/gfm/tests/fixtures/spec_129.md
new file mode 100644
index 0000000..193d9da
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_129.md
@@ -0,0 +1,8 @@
+Example 129
+......
+
+<div><a href="bar">*foo*</a></div>
+
+......
+
+<div><a href="bar">*foo*</a></div>
diff --git a/crates/gfm/tests/fixtures/spec_130.md b/crates/gfm/tests/fixtures/spec_130.md
new file mode 100644
index 0000000..cc86a86
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_130.md
@@ -0,0 +1,12 @@
+Example 130
+......
+
+<table><tr><td>
+foo
+</td></tr></table>
+
+......
+
+<table><tr><td>
+foo
+</td></tr></table>
diff --git a/crates/gfm/tests/fixtures/spec_131.md b/crates/gfm/tests/fixtures/spec_131.md
new file mode 100644
index 0000000..1b0cac7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_131.md
@@ -0,0 +1,14 @@
+Example 131
+......
+
+<div></div>
+``` c
+int x = 33;
+```
+
+......
+
+<div></div>
+``` c
+int x = 33;
+```
diff --git a/crates/gfm/tests/fixtures/spec_132.md b/crates/gfm/tests/fixtures/spec_132.md
new file mode 100644
index 0000000..b4531d0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_132.md
@@ -0,0 +1,12 @@
+Example 132
+......
+
+<a href="foo">
+*bar*
+</a>
+
+......
+
+<a href="foo">
+*bar*
+</a>
diff --git a/crates/gfm/tests/fixtures/spec_133.md b/crates/gfm/tests/fixtures/spec_133.md
new file mode 100644
index 0000000..eab4b61
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_133.md
@@ -0,0 +1,12 @@
+Example 133
+......
+
+<Warning>
+*bar*
+</Warning>
+
+......
+
+<Warning>
+*bar*
+</Warning>
diff --git a/crates/gfm/tests/fixtures/spec_134.md b/crates/gfm/tests/fixtures/spec_134.md
new file mode 100644
index 0000000..da99824
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_134.md
@@ -0,0 +1,12 @@
+Example 134
+......
+
+<i class="foo">
+*bar*
+</i>
+
+......
+
+<i class="foo">
+*bar*
+</i>
diff --git a/crates/gfm/tests/fixtures/spec_135.md b/crates/gfm/tests/fixtures/spec_135.md
new file mode 100644
index 0000000..960a83e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_135.md
@@ -0,0 +1,10 @@
+Example 135
+......
+
+</ins>
+*bar*
+
+......
+
+</ins>
+*bar*
diff --git a/crates/gfm/tests/fixtures/spec_136.md b/crates/gfm/tests/fixtures/spec_136.md
new file mode 100644
index 0000000..365fc2b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_136.md
@@ -0,0 +1,12 @@
+Example 136
+......
+
+<del>
+*foo*
+</del>
+
+......
+
+<del>
+*foo*
+</del>
diff --git a/crates/gfm/tests/fixtures/spec_137.md b/crates/gfm/tests/fixtures/spec_137.md
new file mode 100644
index 0000000..b0f7156
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_137.md
@@ -0,0 +1,14 @@
+Example 137
+......
+
+<del>
+
+*foo*
+
+</del>
+
+......
+
+<del>
+<p><em>foo</em></p>
+</del>
diff --git a/crates/gfm/tests/fixtures/spec_138.md b/crates/gfm/tests/fixtures/spec_138.md
new file mode 100644
index 0000000..9162ed0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_138.md
@@ -0,0 +1,8 @@
+Example 138
+......
+
+<del>*foo*</del>
+
+......
+
+<p><del><em>foo</em></del></p>
diff --git a/crates/gfm/tests/fixtures/spec_139.md b/crates/gfm/tests/fixtures/spec_139.md
new file mode 100644
index 0000000..7612930
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_139.md
@@ -0,0 +1,20 @@
+Example 139
+......
+
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+okay
+
+......
+
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+<p>okay</p>
diff --git a/crates/gfm/tests/fixtures/spec_140_alt.md b/crates/gfm/tests/fixtures/spec_140_alt.md
new file mode 100644
index 0000000..24aa189
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_140_alt.md
@@ -0,0 +1,19 @@
+Example 140
+(tag filter applied)
+......
+
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+okay
+
+......
+
+&lt;script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+<p>okay</p>
diff --git a/crates/gfm/tests/fixtures/spec_141_alt.md b/crates/gfm/tests/fixtures/spec_141_alt.md
new file mode 100644
index 0000000..e688a7a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_141_alt.md
@@ -0,0 +1,21 @@
+Example 141
+(tag filter applied)
+......
+
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+okay
+
+......
+
+&lt;style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+<p>okay</p>
diff --git a/crates/gfm/tests/fixtures/spec_142_alt.md b/crates/gfm/tests/fixtures/spec_142_alt.md
new file mode 100644
index 0000000..85a73f4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_142_alt.md
@@ -0,0 +1,15 @@
+Example 142
+(tag filter applied)
+......
+
+<style
+  type="text/css">
+
+foo
+
+......
+
+&lt;style
+  type="text/css">
+
+foo
diff --git a/crates/gfm/tests/fixtures/spec_143.md b/crates/gfm/tests/fixtures/spec_143.md
new file mode 100644
index 0000000..f818003
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_143.md
@@ -0,0 +1,15 @@
+Example 143
+......
+
+> <div>
+> foo
+
+bar
+
+......
+
+<blockquote>
+<div>
+foo
+</blockquote>
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_144.md b/crates/gfm/tests/fixtures/spec_144.md
new file mode 100644
index 0000000..8eb3d48
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_144.md
@@ -0,0 +1,14 @@
+Example 144
+......
+
+- <div>
+- foo
+
+......
+
+<ul>
+<li>
+<div>
+</li>
+<li>foo</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_145_alt.md b/crates/gfm/tests/fixtures/spec_145_alt.md
new file mode 100644
index 0000000..e917fb7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_145_alt.md
@@ -0,0 +1,11 @@
+Example 145
+(tag filter applied)
+......
+
+<style>p{color:red;}</style>
+*foo*
+
+......
+
+&lt;style>p{color:red;}</style>
+<p><em>foo</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_146.md b/crates/gfm/tests/fixtures/spec_146.md
new file mode 100644
index 0000000..6741e76
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_146.md
@@ -0,0 +1,10 @@
+Example 146
+......
+
+<!-- foo -->*bar*
+*baz*
+
+......
+
+<!-- foo -->*bar*
+<p><em>baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_147_alt.md b/crates/gfm/tests/fixtures/spec_147_alt.md
new file mode 100644
index 0000000..6ca7c8b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_147_alt.md
@@ -0,0 +1,13 @@
+Example 147
+(tag filter applied)
+......
+
+<script>
+foo
+</script>1. *bar*
+
+......
+
+&lt;script>
+foo
+</script>1. *bar*
diff --git a/crates/gfm/tests/fixtures/spec_148.md b/crates/gfm/tests/fixtures/spec_148.md
new file mode 100644
index 0000000..4605bd4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_148.md
@@ -0,0 +1,16 @@
+Example 148
+......
+
+<!-- Foo
+
+bar
+   baz -->
+okay
+
+......
+
+<!-- Foo
+
+bar
+   baz -->
+<p>okay</p>
diff --git a/crates/gfm/tests/fixtures/spec_149.md b/crates/gfm/tests/fixtures/spec_149.md
new file mode 100644
index 0000000..e5cb142
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_149.md
@@ -0,0 +1,18 @@
+Example 149
+......
+
+<?php
+
+  echo '>';
+
+?>
+okay
+
+......
+
+<?php
+
+  echo '>';
+
+?>
+<p>okay</p>
diff --git a/crates/gfm/tests/fixtures/spec_150.md b/crates/gfm/tests/fixtures/spec_150.md
new file mode 100644
index 0000000..049d371
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_150.md
@@ -0,0 +1,8 @@
+Example 150
+......
+
+<!DOCTYPE html>
+
+......
+
+<!DOCTYPE html>
diff --git a/crates/gfm/tests/fixtures/spec_151.md b/crates/gfm/tests/fixtures/spec_151.md
new file mode 100644
index 0000000..7661c85
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_151.md
@@ -0,0 +1,32 @@
+Example 151
+......
+
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+okay
+
+......
+
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+<p>okay</p>
diff --git a/crates/gfm/tests/fixtures/spec_152.md b/crates/gfm/tests/fixtures/spec_152.md
new file mode 100644
index 0000000..9ac98f4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_152.md
@@ -0,0 +1,12 @@
+Example 152
+......
+
+  <!-- foo -->
+
+    <!-- foo -->
+
+......
+
+  <!-- foo -->
+<pre><code>&lt;!-- foo --&gt;
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_153.md b/crates/gfm/tests/fixtures/spec_153.md
new file mode 100644
index 0000000..1800af0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_153.md
@@ -0,0 +1,12 @@
+Example 153
+......
+
+  <div>
+
+    <div>
+
+......
+
+  <div>
+<pre><code>&lt;div&gt;
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_154.md b/crates/gfm/tests/fixtures/spec_154.md
new file mode 100644
index 0000000..c540c07
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_154.md
@@ -0,0 +1,14 @@
+Example 154
+......
+
+Foo
+<div>
+bar
+</div>
+
+......
+
+<p>Foo</p>
+<div>
+bar
+</div>
diff --git a/crates/gfm/tests/fixtures/spec_155.md b/crates/gfm/tests/fixtures/spec_155.md
new file mode 100644
index 0000000..5285985
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_155.md
@@ -0,0 +1,14 @@
+Example 155
+......
+
+<div>
+bar
+</div>
+*foo*
+
+......
+
+<div>
+bar
+</div>
+*foo*
diff --git a/crates/gfm/tests/fixtures/spec_156.md b/crates/gfm/tests/fixtures/spec_156.md
new file mode 100644
index 0000000..d4a8817
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_156.md
@@ -0,0 +1,12 @@
+Example 156
+......
+
+Foo
+<a href="bar">
+baz
+
+......
+
+<p>Foo
+<a href="bar">
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_157.md b/crates/gfm/tests/fixtures/spec_157.md
new file mode 100644
index 0000000..4bffe97
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_157.md
@@ -0,0 +1,14 @@
+Example 157
+......
+
+<div>
+
+*Emphasized* text.
+
+</div>
+
+......
+
+<div>
+<p><em>Emphasized</em> text.</p>
+</div>
diff --git a/crates/gfm/tests/fixtures/spec_158.md b/crates/gfm/tests/fixtures/spec_158.md
new file mode 100644
index 0000000..a4fb761
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_158.md
@@ -0,0 +1,12 @@
+Example 158
+......
+
+<div>
+*Emphasized* text.
+</div>
+
+......
+
+<div>
+*Emphasized* text.
+</div>
diff --git a/crates/gfm/tests/fixtures/spec_159.md b/crates/gfm/tests/fixtures/spec_159.md
new file mode 100644
index 0000000..31236d6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_159.md
@@ -0,0 +1,24 @@
+Example 159
+......
+
+<table>
+
+<tr>
+
+<td>
+Hi
+</td>
+
+</tr>
+
+</table>
+
+......
+
+<table>
+<tr>
+<td>
+Hi
+</td>
+</tr>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_160.md b/crates/gfm/tests/fixtures/spec_160.md
new file mode 100644
index 0000000..5296538
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_160.md
@@ -0,0 +1,25 @@
+Example 160
+......
+
+<table>
+
+  <tr>
+
+    <td>
+      Hi
+    </td>
+
+  </tr>
+
+</table>
+
+......
+
+<table>
+  <tr>
+<pre><code>&lt;td&gt;
+  Hi
+&lt;/td&gt;
+</code></pre>
+  </tr>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_161.md b/crates/gfm/tests/fixtures/spec_161.md
new file mode 100644
index 0000000..9b439d0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_161.md
@@ -0,0 +1,10 @@
+Example 161
+......
+
+[foo]: /url "title"
+
+[foo]
+
+......
+
+<p><a href="/url" title="title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_162.md b/crates/gfm/tests/fixtures/spec_162.md
new file mode 100644
index 0000000..f41bea9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_162.md
@@ -0,0 +1,12 @@
+Example 162
+......
+
+   [foo]: 
+      /url  
+           'the title'  
+
+[foo]
+
+......
+
+<p><a href="/url" title="the title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_163.md b/crates/gfm/tests/fixtures/spec_163.md
new file mode 100644
index 0000000..dbd7e2a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_163.md
@@ -0,0 +1,10 @@
+Example 163
+......
+
+[Foo*bar\]]:my_(url) 'title (with parens)'
+
+[Foo*bar\]]
+
+......
+
+<p><a href="my_(url)" title="title (with parens)">Foo*bar]</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_164.md b/crates/gfm/tests/fixtures/spec_164.md
new file mode 100644
index 0000000..553e873
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_164.md
@@ -0,0 +1,12 @@
+Example 164
+......
+
+[Foo bar]:
+<my url>
+'title'
+
+[Foo bar]
+
+......
+
+<p><a href="my%20url" title="title">Foo bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_165.md b/crates/gfm/tests/fixtures/spec_165.md
new file mode 100644
index 0000000..11a53b6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_165.md
@@ -0,0 +1,18 @@
+Example 165
+......
+
+[foo]: /url '
+title
+line1
+line2
+'
+
+[foo]
+
+......
+
+<p><a href="/url" title="
+title
+line1
+line2
+">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_166.md b/crates/gfm/tests/fixtures/spec_166.md
new file mode 100644
index 0000000..01e171c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_166.md
@@ -0,0 +1,14 @@
+Example 166
+......
+
+[foo]: /url 'title
+
+with blank line'
+
+[foo]
+
+......
+
+<p>[foo]: /url 'title</p>
+<p>with blank line'</p>
+<p>[foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_167.md b/crates/gfm/tests/fixtures/spec_167.md
new file mode 100644
index 0000000..3977a78
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_167.md
@@ -0,0 +1,11 @@
+Example 167
+......
+
+[foo]:
+/url
+
+[foo]
+
+......
+
+<p><a href="/url">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_168.md b/crates/gfm/tests/fixtures/spec_168.md
new file mode 100644
index 0000000..3defcb9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_168.md
@@ -0,0 +1,11 @@
+Example 168
+......
+
+[foo]:
+
+[foo]
+
+......
+
+<p>[foo]:</p>
+<p>[foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_169.md b/crates/gfm/tests/fixtures/spec_169.md
new file mode 100644
index 0000000..35ff236
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_169.md
@@ -0,0 +1,10 @@
+Example 169
+......
+
+[foo]: <>
+
+[foo]
+
+......
+
+<p><a href="">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_170.md b/crates/gfm/tests/fixtures/spec_170.md
new file mode 100644
index 0000000..6b7f0f3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_170.md
@@ -0,0 +1,11 @@
+Example 170
+......
+
+[foo]: <bar>(baz)
+
+[foo]
+
+......
+
+<p>[foo]: <bar>(baz)</p>
+<p>[foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_171.md b/crates/gfm/tests/fixtures/spec_171.md
new file mode 100644
index 0000000..2e1079f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_171.md
@@ -0,0 +1,10 @@
+Example 171
+......
+
+[foo]: /url\bar\*baz "foo\"bar\baz"
+
+[foo]
+
+......
+
+<p><a href="/url%5Cbar*baz" title="foo&quot;bar\baz">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_172.md b/crates/gfm/tests/fixtures/spec_172.md
new file mode 100644
index 0000000..e966cc3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_172.md
@@ -0,0 +1,10 @@
+Example 172
+......
+
+[foo]
+
+[foo]: url
+
+......
+
+<p><a href="url">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_173.md b/crates/gfm/tests/fixtures/spec_173.md
new file mode 100644
index 0000000..4ee7cef
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_173.md
@@ -0,0 +1,11 @@
+Example 173
+......
+
+[foo]
+
+[foo]: first
+[foo]: second
+
+......
+
+<p><a href="first">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_174.md b/crates/gfm/tests/fixtures/spec_174.md
new file mode 100644
index 0000000..c73fa6f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_174.md
@@ -0,0 +1,10 @@
+Example 174
+......
+
+[FOO]: /url
+
+[Foo]
+
+......
+
+<p><a href="/url">Foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_175.md b/crates/gfm/tests/fixtures/spec_175.md
new file mode 100644
index 0000000..5229b0d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_175.md
@@ -0,0 +1,10 @@
+Example 175
+......
+
+[ΑΓΩ]: /φου
+
+[αγω]
+
+......
+
+<p><a href="/%CF%86%CE%BF%CF%85">αγω</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_176.md b/crates/gfm/tests/fixtures/spec_176.md
new file mode 100644
index 0000000..85c1f1a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_176.md
@@ -0,0 +1,6 @@
+Example 176
+......
+
+[foo]: /url
+
+......
diff --git a/crates/gfm/tests/fixtures/spec_177.md b/crates/gfm/tests/fixtures/spec_177.md
new file mode 100644
index 0000000..4abb5f4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_177.md
@@ -0,0 +1,11 @@
+Example 177
+......
+
+[
+foo
+]: /url
+bar
+
+......
+
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_178.md b/crates/gfm/tests/fixtures/spec_178.md
new file mode 100644
index 0000000..f7ad39f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_178.md
@@ -0,0 +1,8 @@
+Example 178
+......
+
+[foo]: /url "title" ok
+
+......
+
+<p>[foo]: /url &quot;title&quot; ok</p>
diff --git a/crates/gfm/tests/fixtures/spec_179.md b/crates/gfm/tests/fixtures/spec_179.md
new file mode 100644
index 0000000..9f3562d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_179.md
@@ -0,0 +1,9 @@
+Example 179
+......
+
+[foo]: /url
+"title" ok
+
+......
+
+<p>&quot;title&quot; ok</p>
diff --git a/crates/gfm/tests/fixtures/spec_180.md b/crates/gfm/tests/fixtures/spec_180.md
new file mode 100644
index 0000000..eedb766
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_180.md
@@ -0,0 +1,12 @@
+Example 180
+......
+
+    [foo]: /url "title"
+
+[foo]
+
+......
+
+<pre><code>[foo]: /url &quot;title&quot;
+</code></pre>
+<p>[foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_181.md b/crates/gfm/tests/fixtures/spec_181.md
new file mode 100644
index 0000000..7f1c10d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_181.md
@@ -0,0 +1,14 @@
+Example 181
+......
+
+```
+[foo]: /url
+```
+
+[foo]
+
+......
+
+<pre><code>[foo]: /url
+</code></pre>
+<p>[foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_182.md b/crates/gfm/tests/fixtures/spec_182.md
new file mode 100644
index 0000000..96c1846
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_182.md
@@ -0,0 +1,13 @@
+Example 182
+......
+
+Foo
+[bar]: /baz
+
+[bar]
+
+......
+
+<p>Foo
+[bar]: /baz</p>
+<p>[bar]</p>
diff --git a/crates/gfm/tests/fixtures/spec_183.md b/crates/gfm/tests/fixtures/spec_183.md
new file mode 100644
index 0000000..a5bf886
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_183.md
@@ -0,0 +1,13 @@
+Example 183
+......
+
+# [Foo]
+[foo]: /url
+> bar
+
+......
+
+<h1><a href="/url">Foo</a></h1>
+<blockquote>
+<p>bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_184.md b/crates/gfm/tests/fixtures/spec_184.md
new file mode 100644
index 0000000..5abf6f4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_184.md
@@ -0,0 +1,12 @@
+Example 184
+......
+
+[foo]: /url
+bar
+===
+[foo]
+
+......
+
+<h1>bar</h1>
+<p><a href="/url">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_185.md b/crates/gfm/tests/fixtures/spec_185.md
new file mode 100644
index 0000000..ca27a7d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_185.md
@@ -0,0 +1,11 @@
+Example 185
+......
+
+[foo]: /url
+===
+[foo]
+
+......
+
+<p>===
+<a href="/url">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_186.md b/crates/gfm/tests/fixtures/spec_186.md
new file mode 100644
index 0000000..7b653f0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_186.md
@@ -0,0 +1,17 @@
+Example 186
+......
+
+[foo]: /foo-url "foo"
+[bar]: /bar-url
+  "bar"
+[baz]: /baz-url
+
+[foo],
+[bar],
+[baz]
+
+......
+
+<p><a href="/foo-url" title="foo">foo</a>,
+<a href="/bar-url" title="bar">bar</a>,
+<a href="/baz-url">baz</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_187.md b/crates/gfm/tests/fixtures/spec_187.md
new file mode 100644
index 0000000..a9ba998
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_187.md
@@ -0,0 +1,12 @@
+Example 187
+......
+
+[foo]
+
+> [foo]: /url
+
+......
+
+<p><a href="/url">foo</a></p>
+<blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_188.md b/crates/gfm/tests/fixtures/spec_188.md
new file mode 100644
index 0000000..7efe3e9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_188.md
@@ -0,0 +1,6 @@
+Example 188
+......
+
+[foo]: /url
+
+......
diff --git a/crates/gfm/tests/fixtures/spec_189.md b/crates/gfm/tests/fixtures/spec_189.md
new file mode 100644
index 0000000..2101f3e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_189.md
@@ -0,0 +1,11 @@
+Example 189
+......
+
+aaa
+
+bbb
+
+......
+
+<p>aaa</p>
+<p>bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_190.md b/crates/gfm/tests/fixtures/spec_190.md
new file mode 100644
index 0000000..7dd3c6b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_190.md
@@ -0,0 +1,15 @@
+Example 190
+......
+
+aaa
+bbb
+
+ccc
+ddd
+
+......
+
+<p>aaa
+bbb</p>
+<p>ccc
+ddd</p>
diff --git a/crates/gfm/tests/fixtures/spec_191.md b/crates/gfm/tests/fixtures/spec_191.md
new file mode 100644
index 0000000..fd1db92
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_191.md
@@ -0,0 +1,12 @@
+Example 191
+......
+
+aaa
+
+
+bbb
+
+......
+
+<p>aaa</p>
+<p>bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_192.md b/crates/gfm/tests/fixtures/spec_192.md
new file mode 100644
index 0000000..2e459f4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_192.md
@@ -0,0 +1,10 @@
+Example 192
+......
+
+  aaa
+ bbb
+
+......
+
+<p>aaa
+bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_193.md b/crates/gfm/tests/fixtures/spec_193.md
new file mode 100644
index 0000000..0270c9b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_193.md
@@ -0,0 +1,12 @@
+Example 193
+......
+
+aaa
+             bbb
+                                       ccc
+
+......
+
+<p>aaa
+bbb
+ccc</p>
diff --git a/crates/gfm/tests/fixtures/spec_194.md b/crates/gfm/tests/fixtures/spec_194.md
new file mode 100644
index 0000000..a120601
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_194.md
@@ -0,0 +1,10 @@
+Example 194
+......
+
+   aaa
+bbb
+
+......
+
+<p>aaa
+bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_195.md b/crates/gfm/tests/fixtures/spec_195.md
new file mode 100644
index 0000000..4e6e755
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_195.md
@@ -0,0 +1,11 @@
+Example 195
+......
+
+    aaa
+bbb
+
+......
+
+<pre><code>aaa
+</code></pre>
+<p>bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_196.md b/crates/gfm/tests/fixtures/spec_196.md
new file mode 100644
index 0000000..b9802f5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_196.md
@@ -0,0 +1,10 @@
+Example 196
+......
+
+aaa     
+bbb     
+
+......
+
+<p>aaa<br />
+bbb</p>
diff --git a/crates/gfm/tests/fixtures/spec_197.md b/crates/gfm/tests/fixtures/spec_197.md
new file mode 100644
index 0000000..f7bdf96
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_197.md
@@ -0,0 +1,16 @@
+Example 197
+......
+
+  
+
+aaa
+  
+
+# aaa
+
+  
+
+......
+
+<p>aaa</p>
+<h1>aaa</h1>
diff --git a/crates/gfm/tests/fixtures/spec_198.md b/crates/gfm/tests/fixtures/spec_198.md
new file mode 100644
index 0000000..ea8ecce
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_198.md
@@ -0,0 +1,23 @@
+Example 198
+......
+
+| foo | bar |
+| --- | --- |
+| baz | bim |
+
+......
+
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>bar</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>baz</td>
+<td>bim</td>
+</tr>
+</tbody>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_199_alt.md b/crates/gfm/tests/fixtures/spec_199_alt.md
new file mode 100644
index 0000000..a69571c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_199_alt.md
@@ -0,0 +1,24 @@
+Example 199
+(how alignments are represented is altered)
+......
+
+| abc | defghi |
+:-: | -----------:
+bar | baz
+
+......
+
+<table>
+<thead>
+<tr>
+<th style="text-align:center">abc</th>
+<th style="text-align:right">defghi</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center">bar</td>
+<td style="text-align:right">baz</td>
+</tr>
+</tbody>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_200.md b/crates/gfm/tests/fixtures/spec_200.md
new file mode 100644
index 0000000..78991dd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_200.md
@@ -0,0 +1,25 @@
+Example 200
+......
+
+| f\|oo  |
+| ------ |
+| b `\|` az |
+| b **\|** im |
+
+......
+
+<table>
+<thead>
+<tr>
+<th>f|oo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>b <code>|</code> az</td>
+</tr>
+<tr>
+<td>b <strong>|</strong> im</td>
+</tr>
+</tbody>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_201.md b/crates/gfm/tests/fixtures/spec_201.md
new file mode 100644
index 0000000..171371e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_201.md
@@ -0,0 +1,27 @@
+Example 201
+......
+
+| abc | def |
+| --- | --- |
+| bar | baz |
+> bar
+
+......
+
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+<blockquote>
+<p>bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_202.md b/crates/gfm/tests/fixtures/spec_202.md
new file mode 100644
index 0000000..c6c7c2c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_202.md
@@ -0,0 +1,31 @@
+Example 202
+......
+
+| abc | def |
+| --- | --- |
+| bar | baz |
+bar
+
+bar
+
+......
+
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+</tbody>
+</table>
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_203.md b/crates/gfm/tests/fixtures/spec_203.md
new file mode 100644
index 0000000..711b351
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_203.md
@@ -0,0 +1,12 @@
+Example 203
+......
+
+| abc | def |
+| --- |
+| bar |
+
+......
+
+<p>| abc | def |
+| --- |
+| bar |</p>
diff --git a/crates/gfm/tests/fixtures/spec_204.md b/crates/gfm/tests/fixtures/spec_204.md
new file mode 100644
index 0000000..519cce1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_204.md
@@ -0,0 +1,28 @@
+Example 204
+......
+
+| abc | def |
+| --- | --- |
+| bar |
+| bar | baz | boo |
+
+......
+
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_205.md b/crates/gfm/tests/fixtures/spec_205.md
new file mode 100644
index 0000000..72d0e66
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_205.md
@@ -0,0 +1,16 @@
+Example 205
+......
+
+| abc | def |
+| --- | --- |
+
+......
+
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+</table>
diff --git a/crates/gfm/tests/fixtures/spec_206.md b/crates/gfm/tests/fixtures/spec_206.md
new file mode 100644
index 0000000..72d497b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_206.md
@@ -0,0 +1,14 @@
+Example 206
+......
+
+> # Foo
+> bar
+> baz
+
+......
+
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_207.md b/crates/gfm/tests/fixtures/spec_207.md
new file mode 100644
index 0000000..8a48f15
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_207.md
@@ -0,0 +1,14 @@
+Example 207
+......
+
+># Foo
+>bar
+> baz
+
+......
+
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_208.md b/crates/gfm/tests/fixtures/spec_208.md
new file mode 100644
index 0000000..69564ea
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_208.md
@@ -0,0 +1,14 @@
+Example 208
+......
+
+   > # Foo
+   > bar
+ > baz
+
+......
+
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_209.md b/crates/gfm/tests/fixtures/spec_209.md
new file mode 100644
index 0000000..8847bb9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_209.md
@@ -0,0 +1,13 @@
+Example 209
+......
+
+    > # Foo
+    > bar
+    > baz
+
+......
+
+<pre><code>&gt; # Foo
+&gt; bar
+&gt; baz
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_210.md b/crates/gfm/tests/fixtures/spec_210.md
new file mode 100644
index 0000000..af20706
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_210.md
@@ -0,0 +1,14 @@
+Example 210
+......
+
+> # Foo
+> bar
+baz
+
+......
+
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_211.md b/crates/gfm/tests/fixtures/spec_211.md
new file mode 100644
index 0000000..f6e892f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_211.md
@@ -0,0 +1,14 @@
+Example 211
+......
+
+> bar
+baz
+> foo
+
+......
+
+<blockquote>
+<p>bar
+baz
+foo</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_212.md b/crates/gfm/tests/fixtures/spec_212.md
new file mode 100644
index 0000000..52c7739
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_212.md
@@ -0,0 +1,12 @@
+Example 212
+......
+
+> foo
+---
+
+......
+
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
diff --git a/crates/gfm/tests/fixtures/spec_213.md b/crates/gfm/tests/fixtures/spec_213.md
new file mode 100644
index 0000000..f90e99b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_213.md
@@ -0,0 +1,16 @@
+Example 213
+......
+
+> - foo
+- bar
+
+......
+
+<blockquote>
+<ul>
+<li>foo</li>
+</ul>
+</blockquote>
+<ul>
+<li>bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_214.md b/crates/gfm/tests/fixtures/spec_214.md
new file mode 100644
index 0000000..35c297c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_214.md
@@ -0,0 +1,14 @@
+Example 214
+......
+
+>     foo
+    bar
+
+......
+
+<blockquote>
+<pre><code>foo
+</code></pre>
+</blockquote>
+<pre><code>bar
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_215.md b/crates/gfm/tests/fixtures/spec_215.md
new file mode 100644
index 0000000..3f36410
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_215.md
@@ -0,0 +1,14 @@
+Example 215
+......
+
+> ```
+foo
+```
+
+......
+
+<blockquote>
+<pre><code></code></pre>
+</blockquote>
+<p>foo</p>
+<pre><code></code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_216.md b/crates/gfm/tests/fixtures/spec_216.md
new file mode 100644
index 0000000..e808555
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_216.md
@@ -0,0 +1,12 @@
+Example 216
+......
+
+> foo
+    - bar
+
+......
+
+<blockquote>
+<p>foo
+- bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_217.md b/crates/gfm/tests/fixtures/spec_217.md
new file mode 100644
index 0000000..f1229bc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_217.md
@@ -0,0 +1,9 @@
+Example 217
+......
+
+>
+
+......
+
+<blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_218.md b/crates/gfm/tests/fixtures/spec_218.md
new file mode 100644
index 0000000..9cb384d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_218.md
@@ -0,0 +1,11 @@
+Example 218
+......
+
+>
+>  
+> 
+
+......
+
+<blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_219.md b/crates/gfm/tests/fixtures/spec_219.md
new file mode 100644
index 0000000..d7dd0b1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_219.md
@@ -0,0 +1,12 @@
+Example 219
+......
+
+>
+> foo
+>  
+
+......
+
+<blockquote>
+<p>foo</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_220.md b/crates/gfm/tests/fixtures/spec_220.md
new file mode 100644
index 0000000..57049f5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_220.md
@@ -0,0 +1,15 @@
+Example 220
+......
+
+> foo
+
+> bar
+
+......
+
+<blockquote>
+<p>foo</p>
+</blockquote>
+<blockquote>
+<p>bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_221.md b/crates/gfm/tests/fixtures/spec_221.md
new file mode 100644
index 0000000..c41ae05
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_221.md
@@ -0,0 +1,12 @@
+Example 221
+......
+
+> foo
+> bar
+
+......
+
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_222.md b/crates/gfm/tests/fixtures/spec_222.md
new file mode 100644
index 0000000..4fe3c54
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_222.md
@@ -0,0 +1,13 @@
+Example 222
+......
+
+> foo
+>
+> bar
+
+......
+
+<blockquote>
+<p>foo</p>
+<p>bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_223.md b/crates/gfm/tests/fixtures/spec_223.md
new file mode 100644
index 0000000..1936b61
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_223.md
@@ -0,0 +1,12 @@
+Example 223
+......
+
+foo
+> bar
+
+......
+
+<p>foo</p>
+<blockquote>
+<p>bar</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_224.md b/crates/gfm/tests/fixtures/spec_224.md
new file mode 100644
index 0000000..9e852dc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_224.md
@@ -0,0 +1,16 @@
+Example 224
+......
+
+> aaa
+***
+> bbb
+
+......
+
+<blockquote>
+<p>aaa</p>
+</blockquote>
+<hr />
+<blockquote>
+<p>bbb</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_225.md b/crates/gfm/tests/fixtures/spec_225.md
new file mode 100644
index 0000000..a48035c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_225.md
@@ -0,0 +1,12 @@
+Example 225
+......
+
+> bar
+baz
+
+......
+
+<blockquote>
+<p>bar
+baz</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_226.md b/crates/gfm/tests/fixtures/spec_226.md
new file mode 100644
index 0000000..78800b9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_226.md
@@ -0,0 +1,13 @@
+Example 226
+......
+
+> bar
+
+baz
+
+......
+
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_227.md b/crates/gfm/tests/fixtures/spec_227.md
new file mode 100644
index 0000000..5fa1a35
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_227.md
@@ -0,0 +1,13 @@
+Example 227
+......
+
+> bar
+>
+baz
+
+......
+
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_228.md b/crates/gfm/tests/fixtures/spec_228.md
new file mode 100644
index 0000000..3010ec2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_228.md
@@ -0,0 +1,16 @@
+Example 228
+......
+
+> > > foo
+bar
+
+......
+
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+</blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_229.md b/crates/gfm/tests/fixtures/spec_229.md
new file mode 100644
index 0000000..3eea019
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_229.md
@@ -0,0 +1,18 @@
+Example 229
+......
+
+>>> foo
+> bar
+>>baz
+
+......
+
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar
+baz</p>
+</blockquote>
+</blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_230.md b/crates/gfm/tests/fixtures/spec_230.md
new file mode 100644
index 0000000..51c0317
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_230.md
@@ -0,0 +1,16 @@
+Example 230
+......
+
+>     code
+
+>    not code
+
+......
+
+<blockquote>
+<pre><code>code
+</code></pre>
+</blockquote>
+<blockquote>
+<p>not code</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_231.md b/crates/gfm/tests/fixtures/spec_231.md
new file mode 100644
index 0000000..a81e113
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_231.md
@@ -0,0 +1,19 @@
+Example 231
+......
+
+A paragraph
+with two lines.
+
+    indented code
+
+> A block quote.
+
+......
+
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_232.md b/crates/gfm/tests/fixtures/spec_232.md
new file mode 100644
index 0000000..7da99c4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_232.md
@@ -0,0 +1,23 @@
+Example 232
+......
+
+1.  A paragraph
+    with two lines.
+
+        indented code
+
+    > A block quote.
+
+......
+
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_233.md b/crates/gfm/tests/fixtures/spec_233.md
new file mode 100644
index 0000000..0e58a4b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_233.md
@@ -0,0 +1,13 @@
+Example 233
+......
+
+- one
+
+ two
+
+......
+
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
diff --git a/crates/gfm/tests/fixtures/spec_234.md b/crates/gfm/tests/fixtures/spec_234.md
new file mode 100644
index 0000000..17771b6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_234.md
@@ -0,0 +1,15 @@
+Example 234
+......
+
+- one
+
+  two
+
+......
+
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_235.md b/crates/gfm/tests/fixtures/spec_235.md
new file mode 100644
index 0000000..767d6f5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_235.md
@@ -0,0 +1,14 @@
+Example 235
+......
+
+ -    one
+
+     two
+
+......
+
+<ul>
+<li>one</li>
+</ul>
+<pre><code> two
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_236.md b/crates/gfm/tests/fixtures/spec_236.md
new file mode 100644
index 0000000..d585325
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_236.md
@@ -0,0 +1,15 @@
+Example 236
+......
+
+ -    one
+
+      two
+
+......
+
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_237.md b/crates/gfm/tests/fixtures/spec_237.md
new file mode 100644
index 0000000..ec3af4c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_237.md
@@ -0,0 +1,19 @@
+Example 237
+......
+
+   > > 1.  one
+>>
+>>     two
+
+......
+
+<blockquote>
+<blockquote>
+<ol>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ol>
+</blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_238.md b/crates/gfm/tests/fixtures/spec_238.md
new file mode 100644
index 0000000..03bf58d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_238.md
@@ -0,0 +1,17 @@
+Example 238
+......
+
+>>- one
+>>
+  >  > two
+
+......
+
+<blockquote>
+<blockquote>
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+</blockquote>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_239.md b/crates/gfm/tests/fixtures/spec_239.md
new file mode 100644
index 0000000..1e6f75a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_239.md
@@ -0,0 +1,11 @@
+Example 239
+......
+
+-one
+
+2.two
+
+......
+
+<p>-one</p>
+<p>2.two</p>
diff --git a/crates/gfm/tests/fixtures/spec_240.md b/crates/gfm/tests/fixtures/spec_240.md
new file mode 100644
index 0000000..1e20a8b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_240.md
@@ -0,0 +1,16 @@
+Example 240
+......
+
+- foo
+
+
+  bar
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_241.md b/crates/gfm/tests/fixtures/spec_241.md
new file mode 100644
index 0000000..482c0a5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_241.md
@@ -0,0 +1,26 @@
+Example 241
+......
+
+1.  foo
+
+    ```
+    bar
+    ```
+
+    baz
+
+    > bam
+
+......
+
+<ol>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+<blockquote>
+<p>bam</p>
+</blockquote>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_242.md b/crates/gfm/tests/fixtures/spec_242.md
new file mode 100644
index 0000000..66f86de
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_242.md
@@ -0,0 +1,22 @@
+Example 242
+......
+
+- Foo
+
+      bar
+
+
+      baz
+
+......
+
+<ul>
+<li>
+<p>Foo</p>
+<pre><code>bar
+
+
+baz
+</code></pre>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_243.md b/crates/gfm/tests/fixtures/spec_243.md
new file mode 100644
index 0000000..a104354
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_243.md
@@ -0,0 +1,10 @@
+Example 243
+......
+
+123456789. ok
+
+......
+
+<ol start="123456789">
+<li>ok</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_244.md b/crates/gfm/tests/fixtures/spec_244.md
new file mode 100644
index 0000000..1faa1a5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_244.md
@@ -0,0 +1,8 @@
+Example 244
+......
+
+1234567890. not ok
+
+......
+
+<p>1234567890. not ok</p>
diff --git a/crates/gfm/tests/fixtures/spec_245.md b/crates/gfm/tests/fixtures/spec_245.md
new file mode 100644
index 0000000..da088b2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_245.md
@@ -0,0 +1,10 @@
+Example 245
+......
+
+0. ok
+
+......
+
+<ol start="0">
+<li>ok</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_246.md b/crates/gfm/tests/fixtures/spec_246.md
new file mode 100644
index 0000000..193f95c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_246.md
@@ -0,0 +1,10 @@
+Example 246
+......
+
+003. ok
+
+......
+
+<ol start="3">
+<li>ok</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_247.md b/crates/gfm/tests/fixtures/spec_247.md
new file mode 100644
index 0000000..fef2103
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_247.md
@@ -0,0 +1,8 @@
+Example 247
+......
+
+-1. not ok
+
+......
+
+<p>-1. not ok</p>
diff --git a/crates/gfm/tests/fixtures/spec_248.md b/crates/gfm/tests/fixtures/spec_248.md
new file mode 100644
index 0000000..fd979fd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_248.md
@@ -0,0 +1,16 @@
+Example 248
+......
+
+- foo
+
+      bar
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_249.md b/crates/gfm/tests/fixtures/spec_249.md
new file mode 100644
index 0000000..35415ac
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_249.md
@@ -0,0 +1,16 @@
+Example 249
+......
+
+  10.  foo
+
+           bar
+
+......
+
+<ol start="10">
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_250.md b/crates/gfm/tests/fixtures/spec_250.md
new file mode 100644
index 0000000..e4e0dba
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_250.md
@@ -0,0 +1,16 @@
+Example 250
+......
+
+    indented code
+
+paragraph
+
+    more code
+
+......
+
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_251.md b/crates/gfm/tests/fixtures/spec_251.md
new file mode 100644
index 0000000..0751399
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_251.md
@@ -0,0 +1,20 @@
+Example 251
+......
+
+1.     indented code
+
+   paragraph
+
+       more code
+
+......
+
+<ol>
+<li>
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_252.md b/crates/gfm/tests/fixtures/spec_252.md
new file mode 100644
index 0000000..604f5b0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_252.md
@@ -0,0 +1,20 @@
+Example 252
+......
+
+1.      indented code
+
+   paragraph
+
+       more code
+
+......
+
+<ol>
+<li>
+<pre><code> indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_253.md b/crates/gfm/tests/fixtures/spec_253.md
new file mode 100644
index 0000000..755f34a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_253.md
@@ -0,0 +1,11 @@
+Example 253
+......
+
+   foo
+
+bar
+
+......
+
+<p>foo</p>
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_254.md b/crates/gfm/tests/fixtures/spec_254.md
new file mode 100644
index 0000000..db4e148
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_254.md
@@ -0,0 +1,13 @@
+Example 254
+......
+
+-    foo
+
+  bar
+
+......
+
+<ul>
+<li>foo</li>
+</ul>
+<p>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_255.md b/crates/gfm/tests/fixtures/spec_255.md
new file mode 100644
index 0000000..ce9c52e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_255.md
@@ -0,0 +1,15 @@
+Example 255
+......
+
+-  foo
+
+   bar
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_256.md b/crates/gfm/tests/fixtures/spec_256.md
new file mode 100644
index 0000000..ab569fe
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_256.md
@@ -0,0 +1,25 @@
+Example 256
+......
+
+-
+  foo
+-
+  ```
+  bar
+  ```
+-
+      baz
+
+......
+
+<ul>
+<li>foo</li>
+<li>
+<pre><code>bar
+</code></pre>
+</li>
+<li>
+<pre><code>baz
+</code></pre>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_257.md b/crates/gfm/tests/fixtures/spec_257.md
new file mode 100644
index 0000000..ab087ad
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_257.md
@@ -0,0 +1,11 @@
+Example 257
+......
+
+-   
+  foo
+
+......
+
+<ul>
+<li>foo</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_258.md b/crates/gfm/tests/fixtures/spec_258.md
new file mode 100644
index 0000000..55c7cf7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_258.md
@@ -0,0 +1,13 @@
+Example 258
+......
+
+-
+
+  foo
+
+......
+
+<ul>
+<li></li>
+</ul>
+<p>foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_259.md b/crates/gfm/tests/fixtures/spec_259.md
new file mode 100644
index 0000000..fa5d8b3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_259.md
@@ -0,0 +1,14 @@
+Example 259
+......
+
+- foo
+-
+- bar
+
+......
+
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_260.md b/crates/gfm/tests/fixtures/spec_260.md
new file mode 100644
index 0000000..bb5810e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_260.md
@@ -0,0 +1,14 @@
+Example 260
+......
+
+- foo
+-   
+- bar
+
+......
+
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_261.md b/crates/gfm/tests/fixtures/spec_261.md
new file mode 100644
index 0000000..7e2a77f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_261.md
@@ -0,0 +1,14 @@
+Example 261
+......
+
+1. foo
+2.
+3. bar
+
+......
+
+<ol>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_262.md b/crates/gfm/tests/fixtures/spec_262.md
new file mode 100644
index 0000000..82e5b62
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_262.md
@@ -0,0 +1,10 @@
+Example 262
+......
+
+*
+
+......
+
+<ul>
+<li></li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_263.md b/crates/gfm/tests/fixtures/spec_263.md
new file mode 100644
index 0000000..5f88fef
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_263.md
@@ -0,0 +1,15 @@
+Example 263
+......
+
+foo
+*
+
+foo
+1.
+
+......
+
+<p>foo
+*</p>
+<p>foo
+1.</p>
diff --git a/crates/gfm/tests/fixtures/spec_264.md b/crates/gfm/tests/fixtures/spec_264.md
new file mode 100644
index 0000000..ada1e5c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_264.md
@@ -0,0 +1,23 @@
+Example 264
+......
+
+ 1.  A paragraph
+     with two lines.
+
+         indented code
+
+     > A block quote.
+
+......
+
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_265.md b/crates/gfm/tests/fixtures/spec_265.md
new file mode 100644
index 0000000..8afc456
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_265.md
@@ -0,0 +1,23 @@
+Example 265
+......
+
+  1.  A paragraph
+      with two lines.
+
+          indented code
+
+      > A block quote.
+
+......
+
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_266.md b/crates/gfm/tests/fixtures/spec_266.md
new file mode 100644
index 0000000..b0cd77d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_266.md
@@ -0,0 +1,23 @@
+Example 266
+......
+
+   1.  A paragraph
+       with two lines.
+
+           indented code
+
+       > A block quote.
+
+......
+
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_267.md b/crates/gfm/tests/fixtures/spec_267.md
new file mode 100644
index 0000000..2885679
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_267.md
@@ -0,0 +1,19 @@
+Example 267
+......
+
+    1.  A paragraph
+        with two lines.
+
+            indented code
+
+        > A block quote.
+
+......
+
+<pre><code>1.  A paragraph
+    with two lines.
+
+        indented code
+
+    &gt; A block quote.
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_268.md b/crates/gfm/tests/fixtures/spec_268.md
new file mode 100644
index 0000000..1a08073
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_268.md
@@ -0,0 +1,23 @@
+Example 268
+......
+
+  1.  A paragraph
+with two lines.
+
+          indented code
+
+      > A block quote.
+
+......
+
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_269.md b/crates/gfm/tests/fixtures/spec_269.md
new file mode 100644
index 0000000..145d5d6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_269.md
@@ -0,0 +1,12 @@
+Example 269
+......
+
+  1.  A paragraph
+    with two lines.
+
+......
+
+<ol>
+<li>A paragraph
+with two lines.</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_270.md b/crates/gfm/tests/fixtures/spec_270.md
new file mode 100644
index 0000000..63f4f7e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_270.md
@@ -0,0 +1,18 @@
+Example 270
+......
+
+> 1. > Blockquote
+continued here.
+
+......
+
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_271.md b/crates/gfm/tests/fixtures/spec_271.md
new file mode 100644
index 0000000..6b51ce8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_271.md
@@ -0,0 +1,18 @@
+Example 271
+......
+
+> 1. > Blockquote
+> continued here.
+
+......
+
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_272.md b/crates/gfm/tests/fixtures/spec_272.md
new file mode 100644
index 0000000..190ec20
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_272.md
@@ -0,0 +1,25 @@
+Example 272
+......
+
+- foo
+  - bar
+    - baz
+      - boo
+
+......
+
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz
+<ul>
+<li>boo</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_273.md b/crates/gfm/tests/fixtures/spec_273.md
new file mode 100644
index 0000000..2324b38
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_273.md
@@ -0,0 +1,16 @@
+Example 273
+......
+
+- foo
+ - bar
+  - baz
+   - boo
+
+......
+
+<ul>
+<li>foo</li>
+<li>bar</li>
+<li>baz</li>
+<li>boo</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_274.md b/crates/gfm/tests/fixtures/spec_274.md
new file mode 100644
index 0000000..b42eb80
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_274.md
@@ -0,0 +1,15 @@
+Example 274
+......
+
+10) foo
+    - bar
+
+......
+
+<ol start="10">
+<li>foo
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_275.md b/crates/gfm/tests/fixtures/spec_275.md
new file mode 100644
index 0000000..91efdcb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_275.md
@@ -0,0 +1,14 @@
+Example 275
+......
+
+10) foo
+   - bar
+
+......
+
+<ol start="10">
+<li>foo</li>
+</ol>
+<ul>
+<li>bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_276.md b/crates/gfm/tests/fixtures/spec_276.md
new file mode 100644
index 0000000..5e561d5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_276.md
@@ -0,0 +1,14 @@
+Example 276
+......
+
+- - foo
+
+......
+
+<ul>
+<li>
+<ul>
+<li>foo</li>
+</ul>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_277.md b/crates/gfm/tests/fixtures/spec_277.md
new file mode 100644
index 0000000..b2dda91
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_277.md
@@ -0,0 +1,18 @@
+Example 277
+......
+
+1. - 2. foo
+
+......
+
+<ol>
+<li>
+<ul>
+<li>
+<ol start="2">
+<li>foo</li>
+</ol>
+</li>
+</ul>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_278.md b/crates/gfm/tests/fixtures/spec_278.md
new file mode 100644
index 0000000..034b936
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_278.md
@@ -0,0 +1,18 @@
+Example 278
+......
+
+- # Foo
+- Bar
+  ---
+  baz
+
+......
+
+<ul>
+<li>
+<h1>Foo</h1>
+</li>
+<li>
+<h2>Bar</h2>
+baz</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_279_alt.md b/crates/gfm/tests/fixtures/spec_279_alt.md
new file mode 100644
index 0000000..b026b8d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_279_alt.md
@@ -0,0 +1,13 @@
+Example 279
+(adds classes to ul/li elements)
+......
+
+- [ ] foo
+- [x] bar
+
+......
+
+<ul class="contains-task-list">
+<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" disabled="" /> foo</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" disabled="" checked="" /> bar</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_280_alt.md b/crates/gfm/tests/fixtures/spec_280_alt.md
new file mode 100644
index 0000000..9747f9b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_280_alt.md
@@ -0,0 +1,20 @@
+Example 280
+(adds classes to ul/li elements)
+......
+
+- [x] foo
+  - [ ] bar
+  - [x] baz
+- [ ] bim
+
+......
+
+<ul class="contains-task-list">
+<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" disabled="" checked="" /> foo
+<ul class="contains-task-list">
+<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" disabled="" /> bar</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" disabled="" checked="" /> baz</li>
+</ul>
+</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" disabled="" /> bim</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_281.md b/crates/gfm/tests/fixtures/spec_281.md
new file mode 100644
index 0000000..f81b0ce
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_281.md
@@ -0,0 +1,16 @@
+Example 281
+......
+
+- foo
+- bar
++ baz
+
+......
+
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<ul>
+<li>baz</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_282.md b/crates/gfm/tests/fixtures/spec_282.md
new file mode 100644
index 0000000..9fec94b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_282.md
@@ -0,0 +1,16 @@
+Example 282
+......
+
+1. foo
+2. bar
+3) baz
+
+......
+
+<ol>
+<li>foo</li>
+<li>bar</li>
+</ol>
+<ol start="3">
+<li>baz</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_283.md b/crates/gfm/tests/fixtures/spec_283.md
new file mode 100644
index 0000000..cf94be8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_283.md
@@ -0,0 +1,14 @@
+Example 283
+......
+
+Foo
+- bar
+- baz
+
+......
+
+<p>Foo</p>
+<ul>
+<li>bar</li>
+<li>baz</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_284.md b/crates/gfm/tests/fixtures/spec_284.md
new file mode 100644
index 0000000..d240d42
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_284.md
@@ -0,0 +1,10 @@
+Example 284
+......
+
+The number of windows in my house is
+14.  The number of doors is 6.
+
+......
+
+<p>The number of windows in my house is
+14.  The number of doors is 6.</p>
diff --git a/crates/gfm/tests/fixtures/spec_285.md b/crates/gfm/tests/fixtures/spec_285.md
new file mode 100644
index 0000000..c2db419
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_285.md
@@ -0,0 +1,12 @@
+Example 285
+......
+
+The number of windows in my house is
+1.  The number of doors is 6.
+
+......
+
+<p>The number of windows in my house is</p>
+<ol>
+<li>The number of doors is 6.</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_286.md b/crates/gfm/tests/fixtures/spec_286.md
new file mode 100644
index 0000000..e6be89e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_286.md
@@ -0,0 +1,23 @@
+Example 286
+......
+
+- foo
+
+- bar
+
+
+- baz
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+</li>
+<li>
+<p>bar</p>
+</li>
+<li>
+<p>baz</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_287.md b/crates/gfm/tests/fixtures/spec_287.md
new file mode 100644
index 0000000..0b5bade
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_287.md
@@ -0,0 +1,26 @@
+Example 287
+......
+
+- foo
+  - bar
+    - baz
+
+
+      bim
+
+......
+
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>
+<p>baz</p>
+<p>bim</p>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_288.md b/crates/gfm/tests/fixtures/spec_288.md
new file mode 100644
index 0000000..634f023
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_288.md
@@ -0,0 +1,22 @@
+Example 288
+......
+
+- foo
+- bar
+
+<!-- -->
+
+- baz
+- bim
+
+......
+
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<!-- -->
+<ul>
+<li>baz</li>
+<li>bim</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_289.md b/crates/gfm/tests/fixtures/spec_289.md
new file mode 100644
index 0000000..f23ef69
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_289.md
@@ -0,0 +1,27 @@
+Example 289
+......
+
+-   foo
+
+    notcode
+
+-   foo
+
+<!-- -->
+
+    code
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<p>notcode</p>
+</li>
+<li>
+<p>foo</p>
+</li>
+</ul>
+<!-- -->
+<pre><code>code
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_290.md b/crates/gfm/tests/fixtures/spec_290.md
new file mode 100644
index 0000000..31b99ff
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_290.md
@@ -0,0 +1,22 @@
+Example 290
+......
+
+- a
+ - b
+  - c
+   - d
+  - e
+ - f
+- g
+
+......
+
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d</li>
+<li>e</li>
+<li>f</li>
+<li>g</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_291.md b/crates/gfm/tests/fixtures/spec_291.md
new file mode 100644
index 0000000..d025293
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_291.md
@@ -0,0 +1,22 @@
+Example 291
+......
+
+1. a
+
+  2. b
+
+   3. c
+
+......
+
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_292.md b/crates/gfm/tests/fixtures/spec_292.md
new file mode 100644
index 0000000..fe8d2ff
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_292.md
@@ -0,0 +1,18 @@
+Example 292
+......
+
+- a
+ - b
+  - c
+   - d
+    - e
+
+......
+
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d
+- e</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_293.md b/crates/gfm/tests/fixtures/spec_293.md
new file mode 100644
index 0000000..249b7ae
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_293.md
@@ -0,0 +1,21 @@
+Example 293
+......
+
+1. a
+
+  2. b
+
+    3. c
+
+......
+
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+</ol>
+<pre><code>3. c
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_294.md b/crates/gfm/tests/fixtures/spec_294.md
new file mode 100644
index 0000000..583b06b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_294.md
@@ -0,0 +1,21 @@
+Example 294
+......
+
+- a
+- b
+
+- c
+
+......
+
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_295.md b/crates/gfm/tests/fixtures/spec_295.md
new file mode 100644
index 0000000..b63130c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_295.md
@@ -0,0 +1,19 @@
+Example 295
+......
+
+* a
+*
+
+* c
+
+......
+
+<ul>
+<li>
+<p>a</p>
+</li>
+<li></li>
+<li>
+<p>c</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_296.md b/crates/gfm/tests/fixtures/spec_296.md
new file mode 100644
index 0000000..366475b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_296.md
@@ -0,0 +1,23 @@
+Example 296
+......
+
+- a
+- b
+
+  c
+- d
+
+......
+
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_297.md b/crates/gfm/tests/fixtures/spec_297.md
new file mode 100644
index 0000000..27206d1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_297.md
@@ -0,0 +1,22 @@
+Example 297
+......
+
+- a
+- b
+
+  [ref]: /url
+- d
+
+......
+
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_298.md b/crates/gfm/tests/fixtures/spec_298.md
new file mode 100644
index 0000000..e7ca418
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_298.md
@@ -0,0 +1,23 @@
+Example 298
+......
+
+- a
+- ```
+  b
+
+
+  ```
+- c
+
+......
+
+<ul>
+<li>a</li>
+<li>
+<pre><code>b
+
+
+</code></pre>
+</li>
+<li>c</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_299.md b/crates/gfm/tests/fixtures/spec_299.md
new file mode 100644
index 0000000..d3679f6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_299.md
@@ -0,0 +1,22 @@
+Example 299
+......
+
+- a
+  - b
+
+    c
+- d
+
+......
+
+<ul>
+<li>a
+<ul>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+</ul>
+</li>
+<li>d</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_300.md b/crates/gfm/tests/fixtures/spec_300.md
new file mode 100644
index 0000000..b1ae89b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_300.md
@@ -0,0 +1,18 @@
+Example 300
+......
+
+* a
+  > b
+  >
+* c
+
+......
+
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+</li>
+<li>c</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_301.md b/crates/gfm/tests/fixtures/spec_301.md
new file mode 100644
index 0000000..6646af7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_301.md
@@ -0,0 +1,22 @@
+Example 301
+......
+
+- a
+  > b
+  ```
+  c
+  ```
+- d
+
+......
+
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+<pre><code>c
+</code></pre>
+</li>
+<li>d</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_302.md b/crates/gfm/tests/fixtures/spec_302.md
new file mode 100644
index 0000000..8004bb9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_302.md
@@ -0,0 +1,10 @@
+Example 302
+......
+
+- a
+
+......
+
+<ul>
+<li>a</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_303.md b/crates/gfm/tests/fixtures/spec_303.md
new file mode 100644
index 0000000..0672ce3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_303.md
@@ -0,0 +1,15 @@
+Example 303
+......
+
+- a
+  - b
+
+......
+
+<ul>
+<li>a
+<ul>
+<li>b</li>
+</ul>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_304.md b/crates/gfm/tests/fixtures/spec_304.md
new file mode 100644
index 0000000..812db70
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_304.md
@@ -0,0 +1,18 @@
+Example 304
+......
+
+1. ```
+   foo
+   ```
+
+   bar
+
+......
+
+<ol>
+<li>
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+</li>
+</ol>
diff --git a/crates/gfm/tests/fixtures/spec_305.md b/crates/gfm/tests/fixtures/spec_305.md
new file mode 100644
index 0000000..4c020fe
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_305.md
@@ -0,0 +1,19 @@
+Example 305
+......
+
+* foo
+  * bar
+
+  baz
+
+......
+
+<ul>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+<p>baz</p>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_306.md b/crates/gfm/tests/fixtures/spec_306.md
new file mode 100644
index 0000000..180fa70
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_306.md
@@ -0,0 +1,29 @@
+Example 306
+......
+
+- a
+  - b
+  - c
+
+- d
+  - e
+  - f
+
+......
+
+<ul>
+<li>
+<p>a</p>
+<ul>
+<li>b</li>
+<li>c</li>
+</ul>
+</li>
+<li>
+<p>d</p>
+<ul>
+<li>e</li>
+<li>f</li>
+</ul>
+</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_307.md b/crates/gfm/tests/fixtures/spec_307.md
new file mode 100644
index 0000000..67822ce
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_307.md
@@ -0,0 +1,8 @@
+Example 307
+......
+
+`hi`lo`
+
+......
+
+<p><code>hi</code>lo`</p>
diff --git a/crates/gfm/tests/fixtures/spec_308.md b/crates/gfm/tests/fixtures/spec_308.md
new file mode 100644
index 0000000..c3083c2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_308.md
@@ -0,0 +1,8 @@
+Example 308
+......
+
+\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\`\{\|\}\~
+
+......
+
+<p>!&quot;#$%&amp;'()*+,-./:;&lt;=&gt;?@[\]^_`{|}~</p>
diff --git a/crates/gfm/tests/fixtures/spec_309.md b/crates/gfm/tests/fixtures/spec_309.md
new file mode 100644
index 0000000..84e20bf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_309.md
@@ -0,0 +1,8 @@
+Example 309
+......
+
+\	\A\a\ \3\φ\«
+
+......
+
+<p>\	\A\a\ \3\φ\«</p>
diff --git a/crates/gfm/tests/fixtures/spec_310.md b/crates/gfm/tests/fixtures/spec_310.md
new file mode 100644
index 0000000..0b544df
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_310.md
@@ -0,0 +1,24 @@
+Example 310
+......
+
+\*not emphasized*
+\<br/> not a tag
+\[not a link](/foo)
+\`not code`
+1\. not a list
+\* not a list
+\# not a heading
+\[foo]: /url "not a reference"
+\&ouml; not a character entity
+
+......
+
+<p>*not emphasized*
+&lt;br/&gt; not a tag
+[not a link](/foo)
+`not code`
+1. not a list
+* not a list
+# not a heading
+[foo]: /url &quot;not a reference&quot;
+&amp;ouml; not a character entity</p>
diff --git a/crates/gfm/tests/fixtures/spec_311.md b/crates/gfm/tests/fixtures/spec_311.md
new file mode 100644
index 0000000..2faff6a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_311.md
@@ -0,0 +1,8 @@
+Example 311
+......
+
+\\*emphasis*
+
+......
+
+<p>\<em>emphasis</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_312.md b/crates/gfm/tests/fixtures/spec_312.md
new file mode 100644
index 0000000..f0f6d4e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_312.md
@@ -0,0 +1,10 @@
+Example 312
+......
+
+foo\
+bar
+
+......
+
+<p>foo<br />
+bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_313.md b/crates/gfm/tests/fixtures/spec_313.md
new file mode 100644
index 0000000..0094237
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_313.md
@@ -0,0 +1,8 @@
+Example 313
+......
+
+`` \[\` ``
+
+......
+
+<p><code>\[\`</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_314.md b/crates/gfm/tests/fixtures/spec_314.md
new file mode 100644
index 0000000..73d92fe
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_314.md
@@ -0,0 +1,9 @@
+Example 314
+......
+
+    \[\]
+
+......
+
+<pre><code>\[\]
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_315.md b/crates/gfm/tests/fixtures/spec_315.md
new file mode 100644
index 0000000..5303419
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_315.md
@@ -0,0 +1,11 @@
+Example 315
+......
+
+~~~
+\[\]
+~~~
+
+......
+
+<pre><code>\[\]
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_316.md b/crates/gfm/tests/fixtures/spec_316.md
new file mode 100644
index 0000000..87ccdc3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_316.md
@@ -0,0 +1,8 @@
+Example 316
+......
+
+<http://example.com?find=\*>
+
+......
+
+<p><a href="http://example.com?find=%5C*">http://example.com?find=\*</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_317.md b/crates/gfm/tests/fixtures/spec_317.md
new file mode 100644
index 0000000..c61cb4b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_317.md
@@ -0,0 +1,8 @@
+Example 317
+......
+
+<a href="/bar\/)">
+
+......
+
+<a href="/bar\/)">
diff --git a/crates/gfm/tests/fixtures/spec_318.md b/crates/gfm/tests/fixtures/spec_318.md
new file mode 100644
index 0000000..eba9aa8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_318.md
@@ -0,0 +1,8 @@
+Example 318
+......
+
+[foo](/bar\* "ti\*tle")
+
+......
+
+<p><a href="/bar*" title="ti*tle">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_319.md b/crates/gfm/tests/fixtures/spec_319.md
new file mode 100644
index 0000000..89edfe9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_319.md
@@ -0,0 +1,10 @@
+Example 319
+......
+
+[foo]
+
+[foo]: /bar\* "ti\*tle"
+
+......
+
+<p><a href="/bar*" title="ti*tle">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_320.md b/crates/gfm/tests/fixtures/spec_320.md
new file mode 100644
index 0000000..7c9f5ba
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_320.md
@@ -0,0 +1,11 @@
+Example 320
+......
+
+``` foo\+bar
+foo
+```
+
+......
+
+<pre><code class="language-foo+bar">foo
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_321.md b/crates/gfm/tests/fixtures/spec_321.md
new file mode 100644
index 0000000..31a4199
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_321.md
@@ -0,0 +1,12 @@
+Example 321
+......
+
+&nbsp; &amp; &copy; &AElig; &Dcaron;
+&frac34; &HilbertSpace; &DifferentialD;
+&ClockwiseContourIntegral; &ngE;
+
+......
+
+<p>  &amp; © Æ Ď
+¾ ℋ ⅆ
+∲ ≧̸</p>
diff --git a/crates/gfm/tests/fixtures/spec_322.md b/crates/gfm/tests/fixtures/spec_322.md
new file mode 100644
index 0000000..913d4db
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_322.md
@@ -0,0 +1,8 @@
+Example 322
+......
+
+&#35; &#1234; &#992; &#0;
+
+......
+
+<p># Ӓ Ϡ �</p>
diff --git a/crates/gfm/tests/fixtures/spec_323.md b/crates/gfm/tests/fixtures/spec_323.md
new file mode 100644
index 0000000..66f005a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_323.md
@@ -0,0 +1,8 @@
+Example 323
+......
+
+&#X22; &#XD06; &#xcab;
+
+......
+
+<p>&quot; ആ ಫ</p>
diff --git a/crates/gfm/tests/fixtures/spec_324.md b/crates/gfm/tests/fixtures/spec_324.md
new file mode 100644
index 0000000..dfd3076
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_324.md
@@ -0,0 +1,14 @@
+Example 324
+......
+
+&nbsp &x; &#; &#x;
+&#987654321;
+&#abcdef0;
+&ThisIsNotDefined; &hi?;
+
+......
+
+<p>&amp;nbsp &amp;x; &amp;#; &amp;#x;
+&amp;#987654321;
+&amp;#abcdef0;
+&amp;ThisIsNotDefined; &amp;hi?;</p>
diff --git a/crates/gfm/tests/fixtures/spec_325.md b/crates/gfm/tests/fixtures/spec_325.md
new file mode 100644
index 0000000..d228f54
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_325.md
@@ -0,0 +1,8 @@
+Example 325
+......
+
+&copy
+
+......
+
+<p>&amp;copy</p>
diff --git a/crates/gfm/tests/fixtures/spec_326.md b/crates/gfm/tests/fixtures/spec_326.md
new file mode 100644
index 0000000..ccf4b14
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_326.md
@@ -0,0 +1,8 @@
+Example 326
+......
+
+&MadeUpEntity;
+
+......
+
+<p>&amp;MadeUpEntity;</p>
diff --git a/crates/gfm/tests/fixtures/spec_327.md b/crates/gfm/tests/fixtures/spec_327.md
new file mode 100644
index 0000000..36be9e9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_327.md
@@ -0,0 +1,8 @@
+Example 327
+......
+
+<a href="&ouml;&ouml;.html">
+
+......
+
+<a href="&ouml;&ouml;.html">
diff --git a/crates/gfm/tests/fixtures/spec_328.md b/crates/gfm/tests/fixtures/spec_328.md
new file mode 100644
index 0000000..0d75743
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_328.md
@@ -0,0 +1,8 @@
+Example 328
+......
+
+[foo](/f&ouml;&ouml; "f&ouml;&ouml;")
+
+......
+
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_329.md b/crates/gfm/tests/fixtures/spec_329.md
new file mode 100644
index 0000000..e844cc7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_329.md
@@ -0,0 +1,10 @@
+Example 329
+......
+
+[foo]
+
+[foo]: /f&ouml;&ouml; "f&ouml;&ouml;"
+
+......
+
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_330.md b/crates/gfm/tests/fixtures/spec_330.md
new file mode 100644
index 0000000..970ee76
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_330.md
@@ -0,0 +1,11 @@
+Example 330
+......
+
+``` f&ouml;&ouml;
+foo
+```
+
+......
+
+<pre><code class="language-föö">foo
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_331.md b/crates/gfm/tests/fixtures/spec_331.md
new file mode 100644
index 0000000..f163525
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_331.md
@@ -0,0 +1,8 @@
+Example 331
+......
+
+`f&ouml;&ouml;`
+
+......
+
+<p><code>f&amp;ouml;&amp;ouml;</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_332.md b/crates/gfm/tests/fixtures/spec_332.md
new file mode 100644
index 0000000..083615a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_332.md
@@ -0,0 +1,9 @@
+Example 332
+......
+
+    f&ouml;f&ouml;
+
+......
+
+<pre><code>f&amp;ouml;f&amp;ouml;
+</code></pre>
diff --git a/crates/gfm/tests/fixtures/spec_333.md b/crates/gfm/tests/fixtures/spec_333.md
new file mode 100644
index 0000000..fec6fcf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_333.md
@@ -0,0 +1,10 @@
+Example 333
+......
+
+&#42;foo&#42;
+*foo*
+
+......
+
+<p>*foo*
+<em>foo</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_334.md b/crates/gfm/tests/fixtures/spec_334.md
new file mode 100644
index 0000000..6a5e8be
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_334.md
@@ -0,0 +1,13 @@
+Example 334
+......
+
+&#42; foo
+
+* foo
+
+......
+
+<p>* foo</p>
+<ul>
+<li>foo</li>
+</ul>
diff --git a/crates/gfm/tests/fixtures/spec_335.md b/crates/gfm/tests/fixtures/spec_335.md
new file mode 100644
index 0000000..03f1add
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_335.md
@@ -0,0 +1,10 @@
+Example 335
+......
+
+foo&#10;&#10;bar
+
+......
+
+<p>foo
+
+bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_336.md b/crates/gfm/tests/fixtures/spec_336.md
new file mode 100644
index 0000000..ca6fa72
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_336.md
@@ -0,0 +1,8 @@
+Example 336
+......
+
+&#9;foo
+
+......
+
+<p>	foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_337.md b/crates/gfm/tests/fixtures/spec_337.md
new file mode 100644
index 0000000..8c1b63a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_337.md
@@ -0,0 +1,8 @@
+Example 337
+......
+
+[a](url &quot;tit&quot;)
+
+......
+
+<p>[a](url &quot;tit&quot;)</p>
diff --git a/crates/gfm/tests/fixtures/spec_338.md b/crates/gfm/tests/fixtures/spec_338.md
new file mode 100644
index 0000000..de8979b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_338.md
@@ -0,0 +1,8 @@
+Example 338
+......
+
+`foo`
+
+......
+
+<p><code>foo</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_339.md b/crates/gfm/tests/fixtures/spec_339.md
new file mode 100644
index 0000000..391bc66
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_339.md
@@ -0,0 +1,8 @@
+Example 339
+......
+
+`` foo ` bar ``
+
+......
+
+<p><code>foo ` bar</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_340.md b/crates/gfm/tests/fixtures/spec_340.md
new file mode 100644
index 0000000..37c8546
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_340.md
@@ -0,0 +1,8 @@
+Example 340
+......
+
+` `` `
+
+......
+
+<p><code>``</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_341.md b/crates/gfm/tests/fixtures/spec_341.md
new file mode 100644
index 0000000..d3f5b01
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_341.md
@@ -0,0 +1,8 @@
+Example 341
+......
+
+`  ``  `
+
+......
+
+<p><code> `` </code></p>
diff --git a/crates/gfm/tests/fixtures/spec_342.md b/crates/gfm/tests/fixtures/spec_342.md
new file mode 100644
index 0000000..e348c9d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_342.md
@@ -0,0 +1,8 @@
+Example 342
+......
+
+` a`
+
+......
+
+<p><code> a</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_343.md b/crates/gfm/tests/fixtures/spec_343.md
new file mode 100644
index 0000000..f755635
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_343.md
@@ -0,0 +1,8 @@
+Example 343
+......
+
+` b `
+
+......
+
+<p><code> b </code></p>
diff --git a/crates/gfm/tests/fixtures/spec_344.md b/crates/gfm/tests/fixtures/spec_344.md
new file mode 100644
index 0000000..5a08692
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_344.md
@@ -0,0 +1,10 @@
+Example 344
+......
+
+` `
+`  `
+
+......
+
+<p><code> </code>
+<code>  </code></p>
diff --git a/crates/gfm/tests/fixtures/spec_345.md b/crates/gfm/tests/fixtures/spec_345.md
new file mode 100644
index 0000000..aa4db7a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_345.md
@@ -0,0 +1,12 @@
+Example 345
+......
+
+``
+foo
+bar  
+baz
+``
+
+......
+
+<p><code>foo bar   baz</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_346.md b/crates/gfm/tests/fixtures/spec_346.md
new file mode 100644
index 0000000..a1ba62f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_346.md
@@ -0,0 +1,10 @@
+Example 346
+......
+
+``
+foo 
+``
+
+......
+
+<p><code>foo </code></p>
diff --git a/crates/gfm/tests/fixtures/spec_347.md b/crates/gfm/tests/fixtures/spec_347.md
new file mode 100644
index 0000000..477bef5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_347.md
@@ -0,0 +1,9 @@
+Example 347
+......
+
+`foo   bar 
+baz`
+
+......
+
+<p><code>foo   bar  baz</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_348.md b/crates/gfm/tests/fixtures/spec_348.md
new file mode 100644
index 0000000..2c53618
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_348.md
@@ -0,0 +1,8 @@
+Example 348
+......
+
+`foo\`bar`
+
+......
+
+<p><code>foo\</code>bar`</p>
diff --git a/crates/gfm/tests/fixtures/spec_349.md b/crates/gfm/tests/fixtures/spec_349.md
new file mode 100644
index 0000000..43a211e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_349.md
@@ -0,0 +1,8 @@
+Example 349
+......
+
+``foo`bar``
+
+......
+
+<p><code>foo`bar</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_350.md b/crates/gfm/tests/fixtures/spec_350.md
new file mode 100644
index 0000000..51bdeb9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_350.md
@@ -0,0 +1,8 @@
+Example 350
+......
+
+` foo `` bar `
+
+......
+
+<p><code>foo `` bar</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_351.md b/crates/gfm/tests/fixtures/spec_351.md
new file mode 100644
index 0000000..72c9d68
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_351.md
@@ -0,0 +1,8 @@
+Example 351
+......
+
+*foo`*`
+
+......
+
+<p>*foo<code>*</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_352.md b/crates/gfm/tests/fixtures/spec_352.md
new file mode 100644
index 0000000..2ef6df1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_352.md
@@ -0,0 +1,8 @@
+Example 352
+......
+
+[not a `link](/foo`)
+
+......
+
+<p>[not a <code>link](/foo</code>)</p>
diff --git a/crates/gfm/tests/fixtures/spec_353.md b/crates/gfm/tests/fixtures/spec_353.md
new file mode 100644
index 0000000..15f54b2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_353.md
@@ -0,0 +1,8 @@
+Example 353
+......
+
+`<a href="`">`
+
+......
+
+<p><code>&lt;a href=&quot;</code>&quot;&gt;`</p>
diff --git a/crates/gfm/tests/fixtures/spec_354.md b/crates/gfm/tests/fixtures/spec_354.md
new file mode 100644
index 0000000..06b4290
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_354.md
@@ -0,0 +1,8 @@
+Example 354
+......
+
+<a href="`">`
+
+......
+
+<p><a href="`">`</p>
diff --git a/crates/gfm/tests/fixtures/spec_355.md b/crates/gfm/tests/fixtures/spec_355.md
new file mode 100644
index 0000000..cde5001
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_355.md
@@ -0,0 +1,8 @@
+Example 355
+......
+
+`<http://foo.bar.`baz>`
+
+......
+
+<p><code>&lt;http://foo.bar.</code>baz&gt;`</p>
diff --git a/crates/gfm/tests/fixtures/spec_356.md b/crates/gfm/tests/fixtures/spec_356.md
new file mode 100644
index 0000000..d6a3006
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_356.md
@@ -0,0 +1,8 @@
+Example 356
+......
+
+<http://foo.bar.`baz>`
+
+......
+
+<p><a href="http://foo.bar.%60baz">http://foo.bar.`baz</a>`</p>
diff --git a/crates/gfm/tests/fixtures/spec_357.md b/crates/gfm/tests/fixtures/spec_357.md
new file mode 100644
index 0000000..6b9e1f8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_357.md
@@ -0,0 +1,8 @@
+Example 357
+......
+
+```foo``
+
+......
+
+<p>```foo``</p>
diff --git a/crates/gfm/tests/fixtures/spec_358.md b/crates/gfm/tests/fixtures/spec_358.md
new file mode 100644
index 0000000..e8774b2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_358.md
@@ -0,0 +1,8 @@
+Example 358
+......
+
+`foo
+
+......
+
+<p>`foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_359.md b/crates/gfm/tests/fixtures/spec_359.md
new file mode 100644
index 0000000..e8662ef
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_359.md
@@ -0,0 +1,8 @@
+Example 359
+......
+
+`foo``bar``
+
+......
+
+<p>`foo<code>bar</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_360.md b/crates/gfm/tests/fixtures/spec_360.md
new file mode 100644
index 0000000..466e87b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_360.md
@@ -0,0 +1,8 @@
+Example 360
+......
+
+*foo bar*
+
+......
+
+<p><em>foo bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_361.md b/crates/gfm/tests/fixtures/spec_361.md
new file mode 100644
index 0000000..fe960c8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_361.md
@@ -0,0 +1,8 @@
+Example 361
+......
+
+a * foo bar*
+
+......
+
+<p>a * foo bar*</p>
diff --git a/crates/gfm/tests/fixtures/spec_362.md b/crates/gfm/tests/fixtures/spec_362.md
new file mode 100644
index 0000000..f1e338a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_362.md
@@ -0,0 +1,8 @@
+Example 362
+......
+
+a*"foo"*
+
+......
+
+<p>a*&quot;foo&quot;*</p>
diff --git a/crates/gfm/tests/fixtures/spec_363.md b/crates/gfm/tests/fixtures/spec_363.md
new file mode 100644
index 0000000..843f36d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_363.md
@@ -0,0 +1,8 @@
+Example 363
+......
+
+* a *
+
+......
+
+<p>* a *</p>
diff --git a/crates/gfm/tests/fixtures/spec_364.md b/crates/gfm/tests/fixtures/spec_364.md
new file mode 100644
index 0000000..be14cac
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_364.md
@@ -0,0 +1,8 @@
+Example 364
+......
+
+foo*bar*
+
+......
+
+<p>foo<em>bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_365.md b/crates/gfm/tests/fixtures/spec_365.md
new file mode 100644
index 0000000..1f8131b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_365.md
@@ -0,0 +1,8 @@
+Example 365
+......
+
+5*6*78
+
+......
+
+<p>5<em>6</em>78</p>
diff --git a/crates/gfm/tests/fixtures/spec_366.md b/crates/gfm/tests/fixtures/spec_366.md
new file mode 100644
index 0000000..2b2cee9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_366.md
@@ -0,0 +1,8 @@
+Example 366
+......
+
+_foo bar_
+
+......
+
+<p><em>foo bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_367.md b/crates/gfm/tests/fixtures/spec_367.md
new file mode 100644
index 0000000..ce2ebe8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_367.md
@@ -0,0 +1,8 @@
+Example 367
+......
+
+_ foo bar_
+
+......
+
+<p>_ foo bar_</p>
diff --git a/crates/gfm/tests/fixtures/spec_368.md b/crates/gfm/tests/fixtures/spec_368.md
new file mode 100644
index 0000000..8251b4a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_368.md
@@ -0,0 +1,8 @@
+Example 368
+......
+
+a_"foo"_
+
+......
+
+<p>a_&quot;foo&quot;_</p>
diff --git a/crates/gfm/tests/fixtures/spec_369.md b/crates/gfm/tests/fixtures/spec_369.md
new file mode 100644
index 0000000..2d456bd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_369.md
@@ -0,0 +1,8 @@
+Example 369
+......
+
+foo_bar_
+
+......
+
+<p>foo_bar_</p>
diff --git a/crates/gfm/tests/fixtures/spec_370.md b/crates/gfm/tests/fixtures/spec_370.md
new file mode 100644
index 0000000..cc52938
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_370.md
@@ -0,0 +1,8 @@
+Example 370
+......
+
+5_6_78
+
+......
+
+<p>5_6_78</p>
diff --git a/crates/gfm/tests/fixtures/spec_371.md b/crates/gfm/tests/fixtures/spec_371.md
new file mode 100644
index 0000000..7b9e7a4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_371.md
@@ -0,0 +1,8 @@
+Example 371
+......
+
+пристаням_стремятся_
+
+......
+
+<p>пристаням_стремятся_</p>
diff --git a/crates/gfm/tests/fixtures/spec_372.md b/crates/gfm/tests/fixtures/spec_372.md
new file mode 100644
index 0000000..e9f7777
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_372.md
@@ -0,0 +1,8 @@
+Example 372
+......
+
+aa_"bb"_cc
+
+......
+
+<p>aa_&quot;bb&quot;_cc</p>
diff --git a/crates/gfm/tests/fixtures/spec_373.md b/crates/gfm/tests/fixtures/spec_373.md
new file mode 100644
index 0000000..4d13923
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_373.md
@@ -0,0 +1,8 @@
+Example 373
+......
+
+foo-_(bar)_
+
+......
+
+<p>foo-<em>(bar)</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_374.md b/crates/gfm/tests/fixtures/spec_374.md
new file mode 100644
index 0000000..58ca2b6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_374.md
@@ -0,0 +1,8 @@
+Example 374
+......
+
+_foo*
+
+......
+
+<p>_foo*</p>
diff --git a/crates/gfm/tests/fixtures/spec_375.md b/crates/gfm/tests/fixtures/spec_375.md
new file mode 100644
index 0000000..99aa90a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_375.md
@@ -0,0 +1,8 @@
+Example 375
+......
+
+*foo bar *
+
+......
+
+<p>*foo bar *</p>
diff --git a/crates/gfm/tests/fixtures/spec_376.md b/crates/gfm/tests/fixtures/spec_376.md
new file mode 100644
index 0000000..35a5f78
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_376.md
@@ -0,0 +1,10 @@
+Example 376
+......
+
+*foo bar
+*
+
+......
+
+<p>*foo bar
+*</p>
diff --git a/crates/gfm/tests/fixtures/spec_377.md b/crates/gfm/tests/fixtures/spec_377.md
new file mode 100644
index 0000000..f80fa7c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_377.md
@@ -0,0 +1,8 @@
+Example 377
+......
+
+*(*foo)
+
+......
+
+<p>*(*foo)</p>
diff --git a/crates/gfm/tests/fixtures/spec_378.md b/crates/gfm/tests/fixtures/spec_378.md
new file mode 100644
index 0000000..30a9982
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_378.md
@@ -0,0 +1,8 @@
+Example 378
+......
+
+*(*foo*)*
+
+......
+
+<p><em>(<em>foo</em>)</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_379.md b/crates/gfm/tests/fixtures/spec_379.md
new file mode 100644
index 0000000..685a1ef
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_379.md
@@ -0,0 +1,8 @@
+Example 379
+......
+
+*foo*bar
+
+......
+
+<p><em>foo</em>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_380.md b/crates/gfm/tests/fixtures/spec_380.md
new file mode 100644
index 0000000..1244ba0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_380.md
@@ -0,0 +1,8 @@
+Example 380
+......
+
+_foo bar _
+
+......
+
+<p>_foo bar _</p>
diff --git a/crates/gfm/tests/fixtures/spec_381.md b/crates/gfm/tests/fixtures/spec_381.md
new file mode 100644
index 0000000..0e05af8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_381.md
@@ -0,0 +1,8 @@
+Example 381
+......
+
+_(_foo)
+
+......
+
+<p>_(_foo)</p>
diff --git a/crates/gfm/tests/fixtures/spec_382.md b/crates/gfm/tests/fixtures/spec_382.md
new file mode 100644
index 0000000..9680c07
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_382.md
@@ -0,0 +1,8 @@
+Example 382
+......
+
+_(_foo_)_
+
+......
+
+<p><em>(<em>foo</em>)</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_383.md b/crates/gfm/tests/fixtures/spec_383.md
new file mode 100644
index 0000000..f7b1a63
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_383.md
@@ -0,0 +1,8 @@
+Example 383
+......
+
+_foo_bar
+
+......
+
+<p>_foo_bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_384.md b/crates/gfm/tests/fixtures/spec_384.md
new file mode 100644
index 0000000..ad9b6fc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_384.md
@@ -0,0 +1,8 @@
+Example 384
+......
+
+_пристаням_стремятся
+
+......
+
+<p>_пристаням_стремятся</p>
diff --git a/crates/gfm/tests/fixtures/spec_385.md b/crates/gfm/tests/fixtures/spec_385.md
new file mode 100644
index 0000000..90f8f8d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_385.md
@@ -0,0 +1,8 @@
+Example 385
+......
+
+_foo_bar_baz_
+
+......
+
+<p><em>foo_bar_baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_386.md b/crates/gfm/tests/fixtures/spec_386.md
new file mode 100644
index 0000000..beb8aea
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_386.md
@@ -0,0 +1,8 @@
+Example 386
+......
+
+_(bar)_.
+
+......
+
+<p><em>(bar)</em>.</p>
diff --git a/crates/gfm/tests/fixtures/spec_387.md b/crates/gfm/tests/fixtures/spec_387.md
new file mode 100644
index 0000000..dbc77c3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_387.md
@@ -0,0 +1,8 @@
+Example 387
+......
+
+**foo bar**
+
+......
+
+<p><strong>foo bar</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_388.md b/crates/gfm/tests/fixtures/spec_388.md
new file mode 100644
index 0000000..e292c73
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_388.md
@@ -0,0 +1,8 @@
+Example 388
+......
+
+** foo bar**
+
+......
+
+<p>** foo bar**</p>
diff --git a/crates/gfm/tests/fixtures/spec_389.md b/crates/gfm/tests/fixtures/spec_389.md
new file mode 100644
index 0000000..9b55772
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_389.md
@@ -0,0 +1,8 @@
+Example 389
+......
+
+a**"foo"**
+
+......
+
+<p>a**&quot;foo&quot;**</p>
diff --git a/crates/gfm/tests/fixtures/spec_390.md b/crates/gfm/tests/fixtures/spec_390.md
new file mode 100644
index 0000000..22611e6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_390.md
@@ -0,0 +1,8 @@
+Example 390
+......
+
+foo**bar**
+
+......
+
+<p>foo<strong>bar</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_391.md b/crates/gfm/tests/fixtures/spec_391.md
new file mode 100644
index 0000000..36a8460
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_391.md
@@ -0,0 +1,8 @@
+Example 391
+......
+
+__foo bar__
+
+......
+
+<p><strong>foo bar</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_392.md b/crates/gfm/tests/fixtures/spec_392.md
new file mode 100644
index 0000000..568389d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_392.md
@@ -0,0 +1,8 @@
+Example 392
+......
+
+__ foo bar__
+
+......
+
+<p>__ foo bar__</p>
diff --git a/crates/gfm/tests/fixtures/spec_393.md b/crates/gfm/tests/fixtures/spec_393.md
new file mode 100644
index 0000000..50b4bc2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_393.md
@@ -0,0 +1,10 @@
+Example 393
+......
+
+__
+foo bar__
+
+......
+
+<p>__
+foo bar__</p>
diff --git a/crates/gfm/tests/fixtures/spec_394.md b/crates/gfm/tests/fixtures/spec_394.md
new file mode 100644
index 0000000..4399d68
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_394.md
@@ -0,0 +1,8 @@
+Example 394
+......
+
+a__"foo"__
+
+......
+
+<p>a__&quot;foo&quot;__</p>
diff --git a/crates/gfm/tests/fixtures/spec_395.md b/crates/gfm/tests/fixtures/spec_395.md
new file mode 100644
index 0000000..872269a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_395.md
@@ -0,0 +1,8 @@
+Example 395
+......
+
+foo__bar__
+
+......
+
+<p>foo__bar__</p>
diff --git a/crates/gfm/tests/fixtures/spec_396.md b/crates/gfm/tests/fixtures/spec_396.md
new file mode 100644
index 0000000..8090bdf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_396.md
@@ -0,0 +1,8 @@
+Example 396
+......
+
+5__6__78
+
+......
+
+<p>5__6__78</p>
diff --git a/crates/gfm/tests/fixtures/spec_397.md b/crates/gfm/tests/fixtures/spec_397.md
new file mode 100644
index 0000000..316dd5f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_397.md
@@ -0,0 +1,8 @@
+Example 397
+......
+
+пристаням__стремятся__
+
+......
+
+<p>пристаням__стремятся__</p>
diff --git a/crates/gfm/tests/fixtures/spec_398.md b/crates/gfm/tests/fixtures/spec_398.md
new file mode 100644
index 0000000..d1353a8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_398.md
@@ -0,0 +1,8 @@
+Example 398
+......
+
+__foo, __bar__, baz__
+
+......
+
+<p><strong>foo, <strong>bar</strong>, baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_399.md b/crates/gfm/tests/fixtures/spec_399.md
new file mode 100644
index 0000000..6d23372
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_399.md
@@ -0,0 +1,8 @@
+Example 399
+......
+
+foo-__(bar)__
+
+......
+
+<p>foo-<strong>(bar)</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_400.md b/crates/gfm/tests/fixtures/spec_400.md
new file mode 100644
index 0000000..2a7c18f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_400.md
@@ -0,0 +1,8 @@
+Example 400
+......
+
+**foo bar **
+
+......
+
+<p>**foo bar **</p>
diff --git a/crates/gfm/tests/fixtures/spec_401.md b/crates/gfm/tests/fixtures/spec_401.md
new file mode 100644
index 0000000..34cd8e6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_401.md
@@ -0,0 +1,8 @@
+Example 401
+......
+
+**(**foo)
+
+......
+
+<p>**(**foo)</p>
diff --git a/crates/gfm/tests/fixtures/spec_402.md b/crates/gfm/tests/fixtures/spec_402.md
new file mode 100644
index 0000000..8a22702
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_402.md
@@ -0,0 +1,8 @@
+Example 402
+......
+
+*(**foo**)*
+
+......
+
+<p><em>(<strong>foo</strong>)</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_403.md b/crates/gfm/tests/fixtures/spec_403.md
new file mode 100644
index 0000000..3da4bf6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_403.md
@@ -0,0 +1,10 @@
+Example 403
+......
+
+**Gomphocarpus (*Gomphocarpus physocarpus*, syn.
+*Asclepias physocarpa*)**
+
+......
+
+<p><strong>Gomphocarpus (<em>Gomphocarpus physocarpus</em>, syn.
+<em>Asclepias physocarpa</em>)</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_404.md b/crates/gfm/tests/fixtures/spec_404.md
new file mode 100644
index 0000000..a822982
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_404.md
@@ -0,0 +1,8 @@
+Example 404
+......
+
+**foo "*bar*" foo**
+
+......
+
+<p><strong>foo &quot;<em>bar</em>&quot; foo</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_405.md b/crates/gfm/tests/fixtures/spec_405.md
new file mode 100644
index 0000000..53d7c3c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_405.md
@@ -0,0 +1,8 @@
+Example 405
+......
+
+**foo**bar
+
+......
+
+<p><strong>foo</strong>bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_406.md b/crates/gfm/tests/fixtures/spec_406.md
new file mode 100644
index 0000000..84e0fee
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_406.md
@@ -0,0 +1,8 @@
+Example 406
+......
+
+__foo bar __
+
+......
+
+<p>__foo bar __</p>
diff --git a/crates/gfm/tests/fixtures/spec_407.md b/crates/gfm/tests/fixtures/spec_407.md
new file mode 100644
index 0000000..a2fe83d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_407.md
@@ -0,0 +1,8 @@
+Example 407
+......
+
+__(__foo)
+
+......
+
+<p>__(__foo)</p>
diff --git a/crates/gfm/tests/fixtures/spec_408.md b/crates/gfm/tests/fixtures/spec_408.md
new file mode 100644
index 0000000..478b5bc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_408.md
@@ -0,0 +1,8 @@
+Example 408
+......
+
+_(__foo__)_
+
+......
+
+<p><em>(<strong>foo</strong>)</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_409.md b/crates/gfm/tests/fixtures/spec_409.md
new file mode 100644
index 0000000..6cf670b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_409.md
@@ -0,0 +1,8 @@
+Example 409
+......
+
+__foo__bar
+
+......
+
+<p>__foo__bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_410.md b/crates/gfm/tests/fixtures/spec_410.md
new file mode 100644
index 0000000..6660eeb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_410.md
@@ -0,0 +1,8 @@
+Example 410
+......
+
+__пристаням__стремятся
+
+......
+
+<p>__пристаням__стремятся</p>
diff --git a/crates/gfm/tests/fixtures/spec_411.md b/crates/gfm/tests/fixtures/spec_411.md
new file mode 100644
index 0000000..c821dec
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_411.md
@@ -0,0 +1,8 @@
+Example 411
+......
+
+__foo__bar__baz__
+
+......
+
+<p><strong>foo__bar__baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_412.md b/crates/gfm/tests/fixtures/spec_412.md
new file mode 100644
index 0000000..d956616
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_412.md
@@ -0,0 +1,8 @@
+Example 412
+......
+
+__(bar)__.
+
+......
+
+<p><strong>(bar)</strong>.</p>
diff --git a/crates/gfm/tests/fixtures/spec_413.md b/crates/gfm/tests/fixtures/spec_413.md
new file mode 100644
index 0000000..9a61bd7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_413.md
@@ -0,0 +1,8 @@
+Example 413
+......
+
+*foo [bar](/url)*
+
+......
+
+<p><em>foo <a href="/url">bar</a></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_414.md b/crates/gfm/tests/fixtures/spec_414.md
new file mode 100644
index 0000000..e63476b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_414.md
@@ -0,0 +1,10 @@
+Example 414
+......
+
+*foo
+bar*
+
+......
+
+<p><em>foo
+bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_415.md b/crates/gfm/tests/fixtures/spec_415.md
new file mode 100644
index 0000000..4333d1d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_415.md
@@ -0,0 +1,8 @@
+Example 415
+......
+
+_foo __bar__ baz_
+
+......
+
+<p><em>foo <strong>bar</strong> baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_416.md b/crates/gfm/tests/fixtures/spec_416.md
new file mode 100644
index 0000000..10a9730
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_416.md
@@ -0,0 +1,8 @@
+Example 416
+......
+
+_foo _bar_ baz_
+
+......
+
+<p><em>foo <em>bar</em> baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_417.md b/crates/gfm/tests/fixtures/spec_417.md
new file mode 100644
index 0000000..f1a2d37
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_417.md
@@ -0,0 +1,8 @@
+Example 417
+......
+
+__foo_ bar_
+
+......
+
+<p><em><em>foo</em> bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_418.md b/crates/gfm/tests/fixtures/spec_418.md
new file mode 100644
index 0000000..f183f77
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_418.md
@@ -0,0 +1,8 @@
+Example 418
+......
+
+*foo *bar**
+
+......
+
+<p><em>foo <em>bar</em></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_419.md b/crates/gfm/tests/fixtures/spec_419.md
new file mode 100644
index 0000000..7201887
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_419.md
@@ -0,0 +1,8 @@
+Example 419
+......
+
+*foo **bar** baz*
+
+......
+
+<p><em>foo <strong>bar</strong> baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_420.md b/crates/gfm/tests/fixtures/spec_420.md
new file mode 100644
index 0000000..0fd4749
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_420.md
@@ -0,0 +1,8 @@
+Example 420
+......
+
+*foo**bar**baz*
+
+......
+
+<p><em>foo<strong>bar</strong>baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_421.md b/crates/gfm/tests/fixtures/spec_421.md
new file mode 100644
index 0000000..e7972fe
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_421.md
@@ -0,0 +1,8 @@
+Example 421
+......
+
+*foo**bar*
+
+......
+
+<p><em>foo**bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_422.md b/crates/gfm/tests/fixtures/spec_422.md
new file mode 100644
index 0000000..916b958
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_422.md
@@ -0,0 +1,8 @@
+Example 422
+......
+
+***foo** bar*
+
+......
+
+<p><em><strong>foo</strong> bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_423.md b/crates/gfm/tests/fixtures/spec_423.md
new file mode 100644
index 0000000..9794c72
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_423.md
@@ -0,0 +1,8 @@
+Example 423
+......
+
+*foo **bar***
+
+......
+
+<p><em>foo <strong>bar</strong></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_424.md b/crates/gfm/tests/fixtures/spec_424.md
new file mode 100644
index 0000000..4882271
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_424.md
@@ -0,0 +1,8 @@
+Example 424
+......
+
+*foo**bar***
+
+......
+
+<p><em>foo<strong>bar</strong></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_425.md b/crates/gfm/tests/fixtures/spec_425.md
new file mode 100644
index 0000000..f4c179c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_425.md
@@ -0,0 +1,8 @@
+Example 425
+......
+
+foo***bar***baz
+
+......
+
+<p>foo<em><strong>bar</strong></em>baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_426.md b/crates/gfm/tests/fixtures/spec_426.md
new file mode 100644
index 0000000..06e08b7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_426.md
@@ -0,0 +1,8 @@
+Example 426
+......
+
+foo******bar*********baz
+
+......
+
+<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_427.md b/crates/gfm/tests/fixtures/spec_427.md
new file mode 100644
index 0000000..344e810
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_427.md
@@ -0,0 +1,8 @@
+Example 427
+......
+
+*foo **bar *baz* bim** bop*
+
+......
+
+<p><em>foo <strong>bar <em>baz</em> bim</strong> bop</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_428.md b/crates/gfm/tests/fixtures/spec_428.md
new file mode 100644
index 0000000..4e86e50
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_428.md
@@ -0,0 +1,8 @@
+Example 428
+......
+
+*foo [*bar*](/url)*
+
+......
+
+<p><em>foo <a href="/url"><em>bar</em></a></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_429.md b/crates/gfm/tests/fixtures/spec_429.md
new file mode 100644
index 0000000..749cfaf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_429.md
@@ -0,0 +1,8 @@
+Example 429
+......
+
+** is not an empty emphasis
+
+......
+
+<p>** is not an empty emphasis</p>
diff --git a/crates/gfm/tests/fixtures/spec_430.md b/crates/gfm/tests/fixtures/spec_430.md
new file mode 100644
index 0000000..2d12612
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_430.md
@@ -0,0 +1,8 @@
+Example 430
+......
+
+**** is not an empty strong emphasis
+
+......
+
+<p>**** is not an empty strong emphasis</p>
diff --git a/crates/gfm/tests/fixtures/spec_431.md b/crates/gfm/tests/fixtures/spec_431.md
new file mode 100644
index 0000000..540f8d8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_431.md
@@ -0,0 +1,8 @@
+Example 431
+......
+
+**foo [bar](/url)**
+
+......
+
+<p><strong>foo <a href="/url">bar</a></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_432.md b/crates/gfm/tests/fixtures/spec_432.md
new file mode 100644
index 0000000..b0a978b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_432.md
@@ -0,0 +1,10 @@
+Example 432
+......
+
+**foo
+bar**
+
+......
+
+<p><strong>foo
+bar</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_433.md b/crates/gfm/tests/fixtures/spec_433.md
new file mode 100644
index 0000000..14ec41c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_433.md
@@ -0,0 +1,8 @@
+Example 433
+......
+
+__foo _bar_ baz__
+
+......
+
+<p><strong>foo <em>bar</em> baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_434.md b/crates/gfm/tests/fixtures/spec_434.md
new file mode 100644
index 0000000..579ac05
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_434.md
@@ -0,0 +1,8 @@
+Example 434
+......
+
+__foo __bar__ baz__
+
+......
+
+<p><strong>foo <strong>bar</strong> baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_435.md b/crates/gfm/tests/fixtures/spec_435.md
new file mode 100644
index 0000000..64cef42
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_435.md
@@ -0,0 +1,8 @@
+Example 435
+......
+
+____foo__ bar__
+
+......
+
+<p><strong><strong>foo</strong> bar</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_436.md b/crates/gfm/tests/fixtures/spec_436.md
new file mode 100644
index 0000000..f8e7fe6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_436.md
@@ -0,0 +1,8 @@
+Example 436
+......
+
+**foo **bar****
+
+......
+
+<p><strong>foo <strong>bar</strong></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_437.md b/crates/gfm/tests/fixtures/spec_437.md
new file mode 100644
index 0000000..b4b53b7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_437.md
@@ -0,0 +1,8 @@
+Example 437
+......
+
+**foo *bar* baz**
+
+......
+
+<p><strong>foo <em>bar</em> baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_438.md b/crates/gfm/tests/fixtures/spec_438.md
new file mode 100644
index 0000000..b5e1f22
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_438.md
@@ -0,0 +1,8 @@
+Example 438
+......
+
+**foo*bar*baz**
+
+......
+
+<p><strong>foo<em>bar</em>baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_439.md b/crates/gfm/tests/fixtures/spec_439.md
new file mode 100644
index 0000000..4510038
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_439.md
@@ -0,0 +1,8 @@
+Example 439
+......
+
+***foo* bar**
+
+......
+
+<p><strong><em>foo</em> bar</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_440.md b/crates/gfm/tests/fixtures/spec_440.md
new file mode 100644
index 0000000..7d0f517
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_440.md
@@ -0,0 +1,8 @@
+Example 440
+......
+
+**foo *bar***
+
+......
+
+<p><strong>foo <em>bar</em></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_441.md b/crates/gfm/tests/fixtures/spec_441.md
new file mode 100644
index 0000000..6d59806
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_441.md
@@ -0,0 +1,10 @@
+Example 441
+......
+
+**foo *bar **baz**
+bim* bop**
+
+......
+
+<p><strong>foo <em>bar <strong>baz</strong>
+bim</em> bop</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_442.md b/crates/gfm/tests/fixtures/spec_442.md
new file mode 100644
index 0000000..edddc64
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_442.md
@@ -0,0 +1,8 @@
+Example 442
+......
+
+**foo [*bar*](/url)**
+
+......
+
+<p><strong>foo <a href="/url"><em>bar</em></a></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_443.md b/crates/gfm/tests/fixtures/spec_443.md
new file mode 100644
index 0000000..99021cb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_443.md
@@ -0,0 +1,8 @@
+Example 443
+......
+
+__ is not an empty emphasis
+
+......
+
+<p>__ is not an empty emphasis</p>
diff --git a/crates/gfm/tests/fixtures/spec_444.md b/crates/gfm/tests/fixtures/spec_444.md
new file mode 100644
index 0000000..42e00c5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_444.md
@@ -0,0 +1,8 @@
+Example 444
+......
+
+____ is not an empty strong emphasis
+
+......
+
+<p>____ is not an empty strong emphasis</p>
diff --git a/crates/gfm/tests/fixtures/spec_445.md b/crates/gfm/tests/fixtures/spec_445.md
new file mode 100644
index 0000000..4ac4d13
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_445.md
@@ -0,0 +1,8 @@
+Example 445
+......
+
+foo ***
+
+......
+
+<p>foo ***</p>
diff --git a/crates/gfm/tests/fixtures/spec_446.md b/crates/gfm/tests/fixtures/spec_446.md
new file mode 100644
index 0000000..e411274
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_446.md
@@ -0,0 +1,8 @@
+Example 446
+......
+
+foo *\**
+
+......
+
+<p>foo <em>*</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_447.md b/crates/gfm/tests/fixtures/spec_447.md
new file mode 100644
index 0000000..99cc4ec
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_447.md
@@ -0,0 +1,8 @@
+Example 447
+......
+
+foo *_*
+
+......
+
+<p>foo <em>_</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_448.md b/crates/gfm/tests/fixtures/spec_448.md
new file mode 100644
index 0000000..965b8f0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_448.md
@@ -0,0 +1,8 @@
+Example 448
+......
+
+foo *****
+
+......
+
+<p>foo *****</p>
diff --git a/crates/gfm/tests/fixtures/spec_449.md b/crates/gfm/tests/fixtures/spec_449.md
new file mode 100644
index 0000000..9344571
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_449.md
@@ -0,0 +1,8 @@
+Example 449
+......
+
+foo **\***
+
+......
+
+<p>foo <strong>*</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_450.md b/crates/gfm/tests/fixtures/spec_450.md
new file mode 100644
index 0000000..39ef17a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_450.md
@@ -0,0 +1,8 @@
+Example 450
+......
+
+foo **_**
+
+......
+
+<p>foo <strong>_</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_451.md b/crates/gfm/tests/fixtures/spec_451.md
new file mode 100644
index 0000000..236240e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_451.md
@@ -0,0 +1,8 @@
+Example 451
+......
+
+**foo*
+
+......
+
+<p>*<em>foo</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_452.md b/crates/gfm/tests/fixtures/spec_452.md
new file mode 100644
index 0000000..26d39e2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_452.md
@@ -0,0 +1,8 @@
+Example 452
+......
+
+*foo**
+
+......
+
+<p><em>foo</em>*</p>
diff --git a/crates/gfm/tests/fixtures/spec_453.md b/crates/gfm/tests/fixtures/spec_453.md
new file mode 100644
index 0000000..66fc776
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_453.md
@@ -0,0 +1,8 @@
+Example 453
+......
+
+***foo**
+
+......
+
+<p>*<strong>foo</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_454.md b/crates/gfm/tests/fixtures/spec_454.md
new file mode 100644
index 0000000..e175a6a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_454.md
@@ -0,0 +1,8 @@
+Example 454
+......
+
+****foo*
+
+......
+
+<p>***<em>foo</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_455.md b/crates/gfm/tests/fixtures/spec_455.md
new file mode 100644
index 0000000..3159c85
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_455.md
@@ -0,0 +1,8 @@
+Example 455
+......
+
+**foo***
+
+......
+
+<p><strong>foo</strong>*</p>
diff --git a/crates/gfm/tests/fixtures/spec_456.md b/crates/gfm/tests/fixtures/spec_456.md
new file mode 100644
index 0000000..69e133b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_456.md
@@ -0,0 +1,8 @@
+Example 456
+......
+
+*foo****
+
+......
+
+<p><em>foo</em>***</p>
diff --git a/crates/gfm/tests/fixtures/spec_457.md b/crates/gfm/tests/fixtures/spec_457.md
new file mode 100644
index 0000000..8e406e5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_457.md
@@ -0,0 +1,8 @@
+Example 457
+......
+
+foo ___
+
+......
+
+<p>foo ___</p>
diff --git a/crates/gfm/tests/fixtures/spec_458.md b/crates/gfm/tests/fixtures/spec_458.md
new file mode 100644
index 0000000..b0f6a3d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_458.md
@@ -0,0 +1,8 @@
+Example 458
+......
+
+foo _\__
+
+......
+
+<p>foo <em>_</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_459.md b/crates/gfm/tests/fixtures/spec_459.md
new file mode 100644
index 0000000..851ae46
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_459.md
@@ -0,0 +1,8 @@
+Example 459
+......
+
+foo _*_
+
+......
+
+<p>foo <em>*</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_460.md b/crates/gfm/tests/fixtures/spec_460.md
new file mode 100644
index 0000000..ef09736
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_460.md
@@ -0,0 +1,8 @@
+Example 460
+......
+
+foo _____
+
+......
+
+<p>foo _____</p>
diff --git a/crates/gfm/tests/fixtures/spec_461.md b/crates/gfm/tests/fixtures/spec_461.md
new file mode 100644
index 0000000..147b517
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_461.md
@@ -0,0 +1,8 @@
+Example 461
+......
+
+foo __\___
+
+......
+
+<p>foo <strong>_</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_462.md b/crates/gfm/tests/fixtures/spec_462.md
new file mode 100644
index 0000000..abd4305
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_462.md
@@ -0,0 +1,8 @@
+Example 462
+......
+
+foo __*__
+
+......
+
+<p>foo <strong>*</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_463.md b/crates/gfm/tests/fixtures/spec_463.md
new file mode 100644
index 0000000..820957e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_463.md
@@ -0,0 +1,8 @@
+Example 463
+......
+
+__foo_
+
+......
+
+<p>_<em>foo</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_464.md b/crates/gfm/tests/fixtures/spec_464.md
new file mode 100644
index 0000000..fb973d7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_464.md
@@ -0,0 +1,8 @@
+Example 464
+......
+
+_foo__
+
+......
+
+<p><em>foo</em>_</p>
diff --git a/crates/gfm/tests/fixtures/spec_465.md b/crates/gfm/tests/fixtures/spec_465.md
new file mode 100644
index 0000000..c122284
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_465.md
@@ -0,0 +1,8 @@
+Example 465
+......
+
+___foo__
+
+......
+
+<p>_<strong>foo</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_466.md b/crates/gfm/tests/fixtures/spec_466.md
new file mode 100644
index 0000000..b8737c6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_466.md
@@ -0,0 +1,8 @@
+Example 466
+......
+
+____foo_
+
+......
+
+<p>___<em>foo</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_467.md b/crates/gfm/tests/fixtures/spec_467.md
new file mode 100644
index 0000000..8fa6b04
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_467.md
@@ -0,0 +1,8 @@
+Example 467
+......
+
+__foo___
+
+......
+
+<p><strong>foo</strong>_</p>
diff --git a/crates/gfm/tests/fixtures/spec_468.md b/crates/gfm/tests/fixtures/spec_468.md
new file mode 100644
index 0000000..e94f131
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_468.md
@@ -0,0 +1,8 @@
+Example 468
+......
+
+_foo____
+
+......
+
+<p><em>foo</em>___</p>
diff --git a/crates/gfm/tests/fixtures/spec_469.md b/crates/gfm/tests/fixtures/spec_469.md
new file mode 100644
index 0000000..dd09b33
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_469.md
@@ -0,0 +1,8 @@
+Example 469
+......
+
+**foo**
+
+......
+
+<p><strong>foo</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_470.md b/crates/gfm/tests/fixtures/spec_470.md
new file mode 100644
index 0000000..3b83a84
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_470.md
@@ -0,0 +1,8 @@
+Example 470
+......
+
+*_foo_*
+
+......
+
+<p><em><em>foo</em></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_471.md b/crates/gfm/tests/fixtures/spec_471.md
new file mode 100644
index 0000000..51ad3e9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_471.md
@@ -0,0 +1,8 @@
+Example 471
+......
+
+__foo__
+
+......
+
+<p><strong>foo</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_472.md b/crates/gfm/tests/fixtures/spec_472.md
new file mode 100644
index 0000000..d154868
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_472.md
@@ -0,0 +1,8 @@
+Example 472
+......
+
+_*foo*_
+
+......
+
+<p><em><em>foo</em></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_473.md b/crates/gfm/tests/fixtures/spec_473.md
new file mode 100644
index 0000000..e3eb775
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_473.md
@@ -0,0 +1,8 @@
+Example 473
+......
+
+****foo****
+
+......
+
+<p><strong><strong>foo</strong></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_474.md b/crates/gfm/tests/fixtures/spec_474.md
new file mode 100644
index 0000000..43c0eff
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_474.md
@@ -0,0 +1,8 @@
+Example 474
+......
+
+____foo____
+
+......
+
+<p><strong><strong>foo</strong></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_475.md b/crates/gfm/tests/fixtures/spec_475.md
new file mode 100644
index 0000000..25fee7b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_475.md
@@ -0,0 +1,8 @@
+Example 475
+......
+
+******foo******
+
+......
+
+<p><strong><strong><strong>foo</strong></strong></strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_476.md b/crates/gfm/tests/fixtures/spec_476.md
new file mode 100644
index 0000000..d3ee877
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_476.md
@@ -0,0 +1,8 @@
+Example 476
+......
+
+***foo***
+
+......
+
+<p><em><strong>foo</strong></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_477.md b/crates/gfm/tests/fixtures/spec_477.md
new file mode 100644
index 0000000..60535d7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_477.md
@@ -0,0 +1,8 @@
+Example 477
+......
+
+_____foo_____
+
+......
+
+<p><em><strong><strong>foo</strong></strong></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_478.md b/crates/gfm/tests/fixtures/spec_478.md
new file mode 100644
index 0000000..e2712a5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_478.md
@@ -0,0 +1,8 @@
+Example 478
+......
+
+*foo _bar* baz_
+
+......
+
+<p><em>foo _bar</em> baz_</p>
diff --git a/crates/gfm/tests/fixtures/spec_479.md b/crates/gfm/tests/fixtures/spec_479.md
new file mode 100644
index 0000000..901a111
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_479.md
@@ -0,0 +1,8 @@
+Example 479
+......
+
+*foo __bar *baz bim__ bam*
+
+......
+
+<p><em>foo <strong>bar *baz bim</strong> bam</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_480.md b/crates/gfm/tests/fixtures/spec_480.md
new file mode 100644
index 0000000..6a2a51d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_480.md
@@ -0,0 +1,8 @@
+Example 480
+......
+
+**foo **bar baz**
+
+......
+
+<p>**foo <strong>bar baz</strong></p>
diff --git a/crates/gfm/tests/fixtures/spec_481.md b/crates/gfm/tests/fixtures/spec_481.md
new file mode 100644
index 0000000..fbd02e9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_481.md
@@ -0,0 +1,8 @@
+Example 481
+......
+
+*foo *bar baz*
+
+......
+
+<p>*foo <em>bar baz</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_482.md b/crates/gfm/tests/fixtures/spec_482.md
new file mode 100644
index 0000000..001ec76
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_482.md
@@ -0,0 +1,8 @@
+Example 482
+......
+
+*[bar*](/url)
+
+......
+
+<p>*<a href="/url">bar*</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_483.md b/crates/gfm/tests/fixtures/spec_483.md
new file mode 100644
index 0000000..f2ea3da
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_483.md
@@ -0,0 +1,8 @@
+Example 483
+......
+
+_foo [bar_](/url)
+
+......
+
+<p>_foo <a href="/url">bar_</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_484.md b/crates/gfm/tests/fixtures/spec_484.md
new file mode 100644
index 0000000..4dcf550
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_484.md
@@ -0,0 +1,8 @@
+Example 484
+......
+
+*<img src="foo" title="*"/>
+
+......
+
+<p>*<img src="foo" title="*"/></p>
diff --git a/crates/gfm/tests/fixtures/spec_485.md b/crates/gfm/tests/fixtures/spec_485.md
new file mode 100644
index 0000000..8f0de8b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_485.md
@@ -0,0 +1,8 @@
+Example 485
+......
+
+**<a href="**">
+
+......
+
+<p>**<a href="**"></p>
diff --git a/crates/gfm/tests/fixtures/spec_486.md b/crates/gfm/tests/fixtures/spec_486.md
new file mode 100644
index 0000000..d2dde87
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_486.md
@@ -0,0 +1,8 @@
+Example 486
+......
+
+__<a href="__">
+
+......
+
+<p>__<a href="__"></p>
diff --git a/crates/gfm/tests/fixtures/spec_487.md b/crates/gfm/tests/fixtures/spec_487.md
new file mode 100644
index 0000000..b6c2800
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_487.md
@@ -0,0 +1,8 @@
+Example 487
+......
+
+*a `*`*
+
+......
+
+<p><em>a <code>*</code></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_488.md b/crates/gfm/tests/fixtures/spec_488.md
new file mode 100644
index 0000000..35399ba
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_488.md
@@ -0,0 +1,8 @@
+Example 488
+......
+
+_a `_`_
+
+......
+
+<p><em>a <code>_</code></em></p>
diff --git a/crates/gfm/tests/fixtures/spec_489.md b/crates/gfm/tests/fixtures/spec_489.md
new file mode 100644
index 0000000..ef1cf9e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_489.md
@@ -0,0 +1,8 @@
+Example 489
+......
+
+**a<http://foo.bar/?q=**>
+
+......
+
+<p>**a<a href="http://foo.bar/?q=**">http://foo.bar/?q=**</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_490.md b/crates/gfm/tests/fixtures/spec_490.md
new file mode 100644
index 0000000..05e1242
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_490.md
@@ -0,0 +1,8 @@
+Example 490
+......
+
+__a<http://foo.bar/?q=__>
+
+......
+
+<p>__a<a href="http://foo.bar/?q=__">http://foo.bar/?q=__</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_492.md b/crates/gfm/tests/fixtures/spec_492.md
new file mode 100644
index 0000000..ce65aee
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_492.md
@@ -0,0 +1,11 @@
+Example 492
+......
+
+This ~~has a
+
+new paragraph~~.
+
+......
+
+<p>This ~~has a</p>
+<p>new paragraph~~.</p>
diff --git a/crates/gfm/tests/fixtures/spec_494.md b/crates/gfm/tests/fixtures/spec_494.md
new file mode 100644
index 0000000..30fd055
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_494.md
@@ -0,0 +1,8 @@
+Example 494
+......
+
+[link](/uri "title")
+
+......
+
+<p><a href="/uri" title="title">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_495.md b/crates/gfm/tests/fixtures/spec_495.md
new file mode 100644
index 0000000..fe498ec
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_495.md
@@ -0,0 +1,8 @@
+Example 495
+......
+
+[link](/uri)
+
+......
+
+<p><a href="/uri">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_496.md b/crates/gfm/tests/fixtures/spec_496.md
new file mode 100644
index 0000000..5fbb9f5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_496.md
@@ -0,0 +1,8 @@
+Example 496
+......
+
+[link]()
+
+......
+
+<p><a href="">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_497.md b/crates/gfm/tests/fixtures/spec_497.md
new file mode 100644
index 0000000..80d4520
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_497.md
@@ -0,0 +1,8 @@
+Example 497
+......
+
+[link](<>)
+
+......
+
+<p><a href="">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_498.md b/crates/gfm/tests/fixtures/spec_498.md
new file mode 100644
index 0000000..8f5060c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_498.md
@@ -0,0 +1,8 @@
+Example 498
+......
+
+[link](/my uri)
+
+......
+
+<p>[link](/my uri)</p>
diff --git a/crates/gfm/tests/fixtures/spec_499.md b/crates/gfm/tests/fixtures/spec_499.md
new file mode 100644
index 0000000..89c35e3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_499.md
@@ -0,0 +1,8 @@
+Example 499
+......
+
+[link](</my uri>)
+
+......
+
+<p><a href="/my%20uri">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_500.md b/crates/gfm/tests/fixtures/spec_500.md
new file mode 100644
index 0000000..638a566
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_500.md
@@ -0,0 +1,10 @@
+Example 500
+......
+
+[link](foo
+bar)
+
+......
+
+<p>[link](foo
+bar)</p>
diff --git a/crates/gfm/tests/fixtures/spec_501.md b/crates/gfm/tests/fixtures/spec_501.md
new file mode 100644
index 0000000..2a35850
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_501.md
@@ -0,0 +1,10 @@
+Example 501
+......
+
+[link](<foo
+bar>)
+
+......
+
+<p>[link](<foo
+bar>)</p>
diff --git a/crates/gfm/tests/fixtures/spec_502.md b/crates/gfm/tests/fixtures/spec_502.md
new file mode 100644
index 0000000..79995f5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_502.md
@@ -0,0 +1,8 @@
+Example 502
+......
+
+[a](<b)c>)
+
+......
+
+<p><a href="b)c">a</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_503.md b/crates/gfm/tests/fixtures/spec_503.md
new file mode 100644
index 0000000..8689f5f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_503.md
@@ -0,0 +1,8 @@
+Example 503
+......
+
+[link](<foo\>)
+
+......
+
+<p>[link](&lt;foo&gt;)</p>
diff --git a/crates/gfm/tests/fixtures/spec_504.md b/crates/gfm/tests/fixtures/spec_504.md
new file mode 100644
index 0000000..cac54f6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_504.md
@@ -0,0 +1,12 @@
+Example 504
+......
+
+[a](<b)c
+[a](<b)c>
+[a](<b>c)
+
+......
+
+<p>[a](&lt;b)c
+[a](&lt;b)c&gt;
+[a](<b>c)</p>
diff --git a/crates/gfm/tests/fixtures/spec_505.md b/crates/gfm/tests/fixtures/spec_505.md
new file mode 100644
index 0000000..900f66a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_505.md
@@ -0,0 +1,8 @@
+Example 505
+......
+
+[link](\(foo\))
+
+......
+
+<p><a href="(foo)">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_506.md b/crates/gfm/tests/fixtures/spec_506.md
new file mode 100644
index 0000000..44e8894
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_506.md
@@ -0,0 +1,8 @@
+Example 506
+......
+
+[link](foo(and(bar)))
+
+......
+
+<p><a href="foo(and(bar))">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_507.md b/crates/gfm/tests/fixtures/spec_507.md
new file mode 100644
index 0000000..c25499b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_507.md
@@ -0,0 +1,8 @@
+Example 507
+......
+
+[link](foo\(and\(bar\))
+
+......
+
+<p><a href="foo(and(bar)">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_508.md b/crates/gfm/tests/fixtures/spec_508.md
new file mode 100644
index 0000000..2427cf5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_508.md
@@ -0,0 +1,8 @@
+Example 508
+......
+
+[link](<foo(and(bar)>)
+
+......
+
+<p><a href="foo(and(bar)">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_509.md b/crates/gfm/tests/fixtures/spec_509.md
new file mode 100644
index 0000000..d4ec542
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_509.md
@@ -0,0 +1,8 @@
+Example 509
+......
+
+[link](foo\)\:)
+
+......
+
+<p><a href="foo):">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_510.md b/crates/gfm/tests/fixtures/spec_510.md
new file mode 100644
index 0000000..33dc956
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_510.md
@@ -0,0 +1,14 @@
+Example 510
+......
+
+[link](#fragment)
+
+[link](http://example.com#fragment)
+
+[link](http://example.com?foo=3#frag)
+
+......
+
+<p><a href="#fragment">link</a></p>
+<p><a href="http://example.com#fragment">link</a></p>
+<p><a href="http://example.com?foo=3#frag">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_511.md b/crates/gfm/tests/fixtures/spec_511.md
new file mode 100644
index 0000000..c096993
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_511.md
@@ -0,0 +1,8 @@
+Example 511
+......
+
+[link](foo\bar)
+
+......
+
+<p><a href="foo%5Cbar">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_512.md b/crates/gfm/tests/fixtures/spec_512.md
new file mode 100644
index 0000000..7295a0d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_512.md
@@ -0,0 +1,8 @@
+Example 512
+......
+
+[link](foo%20b&auml;)
+
+......
+
+<p><a href="foo%20b%C3%A4">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_513.md b/crates/gfm/tests/fixtures/spec_513.md
new file mode 100644
index 0000000..123be77
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_513.md
@@ -0,0 +1,8 @@
+Example 513
+......
+
+[link]("title")
+
+......
+
+<p><a href="%22title%22">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_514.md b/crates/gfm/tests/fixtures/spec_514.md
new file mode 100644
index 0000000..05ad781
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_514.md
@@ -0,0 +1,12 @@
+Example 514
+......
+
+[link](/url "title")
+[link](/url 'title')
+[link](/url (title))
+
+......
+
+<p><a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_515.md b/crates/gfm/tests/fixtures/spec_515.md
new file mode 100644
index 0000000..38dda46
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_515.md
@@ -0,0 +1,8 @@
+Example 515
+......
+
+[link](/url "title \"&quot;")
+
+......
+
+<p><a href="/url" title="title &quot;&quot;">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_516.md b/crates/gfm/tests/fixtures/spec_516.md
new file mode 100644
index 0000000..bb7dd36
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_516.md
@@ -0,0 +1,8 @@
+Example 516
+......
+
+[link](/url "title")
+
+......
+
+<p><a href="/url%C2%A0%22title%22">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_517.md b/crates/gfm/tests/fixtures/spec_517.md
new file mode 100644
index 0000000..440cd03
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_517.md
@@ -0,0 +1,8 @@
+Example 517
+......
+
+[link](/url "title "and" title")
+
+......
+
+<p>[link](/url &quot;title &quot;and&quot; title&quot;)</p>
diff --git a/crates/gfm/tests/fixtures/spec_518.md b/crates/gfm/tests/fixtures/spec_518.md
new file mode 100644
index 0000000..211784b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_518.md
@@ -0,0 +1,8 @@
+Example 518
+......
+
+[link](/url 'title "and" title')
+
+......
+
+<p><a href="/url" title="title &quot;and&quot; title">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_519.md b/crates/gfm/tests/fixtures/spec_519.md
new file mode 100644
index 0000000..e73d3b1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_519.md
@@ -0,0 +1,9 @@
+Example 519
+......
+
+[link](   /uri
+  "title"  )
+
+......
+
+<p><a href="/uri" title="title">link</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_520.md b/crates/gfm/tests/fixtures/spec_520.md
new file mode 100644
index 0000000..ef1242b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_520.md
@@ -0,0 +1,8 @@
+Example 520
+......
+
+[link] (/uri)
+
+......
+
+<p>[link] (/uri)</p>
diff --git a/crates/gfm/tests/fixtures/spec_521.md b/crates/gfm/tests/fixtures/spec_521.md
new file mode 100644
index 0000000..68a44d5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_521.md
@@ -0,0 +1,8 @@
+Example 521
+......
+
+[link [foo [bar]]](/uri)
+
+......
+
+<p><a href="/uri">link [foo [bar]]</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_522.md b/crates/gfm/tests/fixtures/spec_522.md
new file mode 100644
index 0000000..82dafef
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_522.md
@@ -0,0 +1,8 @@
+Example 522
+......
+
+[link] bar](/uri)
+
+......
+
+<p>[link] bar](/uri)</p>
diff --git a/crates/gfm/tests/fixtures/spec_523.md b/crates/gfm/tests/fixtures/spec_523.md
new file mode 100644
index 0000000..f1c2162
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_523.md
@@ -0,0 +1,8 @@
+Example 523
+......
+
+[link [bar](/uri)
+
+......
+
+<p>[link <a href="/uri">bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_524.md b/crates/gfm/tests/fixtures/spec_524.md
new file mode 100644
index 0000000..6daaa36
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_524.md
@@ -0,0 +1,8 @@
+Example 524
+......
+
+[link \[bar](/uri)
+
+......
+
+<p><a href="/uri">link [bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_525.md b/crates/gfm/tests/fixtures/spec_525.md
new file mode 100644
index 0000000..5e2a9c0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_525.md
@@ -0,0 +1,8 @@
+Example 525
+......
+
+[link *foo **bar** `#`*](/uri)
+
+......
+
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
diff --git a/crates/gfm/tests/fixtures/spec_526.md b/crates/gfm/tests/fixtures/spec_526.md
new file mode 100644
index 0000000..a6819d9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_526.md
@@ -0,0 +1,8 @@
+Example 526
+......
+
+[![moon](moon.jpg)](/uri)
+
+......
+
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
diff --git a/crates/gfm/tests/fixtures/spec_527.md b/crates/gfm/tests/fixtures/spec_527.md
new file mode 100644
index 0000000..676cc32
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_527.md
@@ -0,0 +1,8 @@
+Example 527
+......
+
+[foo [bar](/uri)](/uri)
+
+......
+
+<p>[foo <a href="/uri">bar</a>](/uri)</p>
diff --git a/crates/gfm/tests/fixtures/spec_528.md b/crates/gfm/tests/fixtures/spec_528.md
new file mode 100644
index 0000000..0108e07
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_528.md
@@ -0,0 +1,8 @@
+Example 528
+......
+
+[foo *[bar [baz](/uri)](/uri)*](/uri)
+
+......
+
+<p>[foo <em>[bar <a href="/uri">baz</a>](/uri)</em>](/uri)</p>
diff --git a/crates/gfm/tests/fixtures/spec_529.md b/crates/gfm/tests/fixtures/spec_529.md
new file mode 100644
index 0000000..c96c508
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_529.md
@@ -0,0 +1,8 @@
+Example 529
+......
+
+![[[foo](uri1)](uri2)](uri3)
+
+......
+
+<p><img src="uri3" alt="[foo](uri2)" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_530.md b/crates/gfm/tests/fixtures/spec_530.md
new file mode 100644
index 0000000..5199495
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_530.md
@@ -0,0 +1,8 @@
+Example 530
+......
+
+*[foo*](/uri)
+
+......
+
+<p>*<a href="/uri">foo*</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_531.md b/crates/gfm/tests/fixtures/spec_531.md
new file mode 100644
index 0000000..1975222
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_531.md
@@ -0,0 +1,8 @@
+Example 531
+......
+
+[foo *bar](baz*)
+
+......
+
+<p><a href="baz*">foo *bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_532.md b/crates/gfm/tests/fixtures/spec_532.md
new file mode 100644
index 0000000..903c511
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_532.md
@@ -0,0 +1,8 @@
+Example 532
+......
+
+*foo [bar* baz]
+
+......
+
+<p><em>foo [bar</em> baz]</p>
diff --git a/crates/gfm/tests/fixtures/spec_533.md b/crates/gfm/tests/fixtures/spec_533.md
new file mode 100644
index 0000000..24ee9ba
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_533.md
@@ -0,0 +1,8 @@
+Example 533
+......
+
+[foo <bar attr="](baz)">
+
+......
+
+<p>[foo <bar attr="](baz)"></p>
diff --git a/crates/gfm/tests/fixtures/spec_534.md b/crates/gfm/tests/fixtures/spec_534.md
new file mode 100644
index 0000000..63932f3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_534.md
@@ -0,0 +1,8 @@
+Example 534
+......
+
+[foo`](/uri)`
+
+......
+
+<p>[foo<code>](/uri)</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_535.md b/crates/gfm/tests/fixtures/spec_535.md
new file mode 100644
index 0000000..c152c5d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_535.md
@@ -0,0 +1,8 @@
+Example 535
+......
+
+[foo<http://example.com/?search=](uri)>
+
+......
+
+<p>[foo<a href="http://example.com/?search=%5D(uri)">http://example.com/?search=](uri)</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_536.md b/crates/gfm/tests/fixtures/spec_536.md
new file mode 100644
index 0000000..07d1c74
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_536.md
@@ -0,0 +1,10 @@
+Example 536
+......
+
+[foo][bar]
+
+[bar]: /url "title"
+
+......
+
+<p><a href="/url" title="title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_537.md b/crates/gfm/tests/fixtures/spec_537.md
new file mode 100644
index 0000000..f764106
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_537.md
@@ -0,0 +1,10 @@
+Example 537
+......
+
+[link [foo [bar]]][ref]
+
+[ref]: /uri
+
+......
+
+<p><a href="/uri">link [foo [bar]]</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_538.md b/crates/gfm/tests/fixtures/spec_538.md
new file mode 100644
index 0000000..eeb69cc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_538.md
@@ -0,0 +1,10 @@
+Example 538
+......
+
+[link \[bar][ref]
+
+[ref]: /uri
+
+......
+
+<p><a href="/uri">link [bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_539.md b/crates/gfm/tests/fixtures/spec_539.md
new file mode 100644
index 0000000..d266598
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_539.md
@@ -0,0 +1,10 @@
+Example 539
+......
+
+[link *foo **bar** `#`*][ref]
+
+[ref]: /uri
+
+......
+
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
diff --git a/crates/gfm/tests/fixtures/spec_540.md b/crates/gfm/tests/fixtures/spec_540.md
new file mode 100644
index 0000000..211630f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_540.md
@@ -0,0 +1,10 @@
+Example 540
+......
+
+[![moon](moon.jpg)][ref]
+
+[ref]: /uri
+
+......
+
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
diff --git a/crates/gfm/tests/fixtures/spec_541.md b/crates/gfm/tests/fixtures/spec_541.md
new file mode 100644
index 0000000..b1a930a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_541.md
@@ -0,0 +1,10 @@
+Example 541
+......
+
+[foo [bar](/uri)][ref]
+
+[ref]: /uri
+
+......
+
+<p>[foo <a href="/uri">bar</a>]<a href="/uri">ref</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_542.md b/crates/gfm/tests/fixtures/spec_542.md
new file mode 100644
index 0000000..81eb53d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_542.md
@@ -0,0 +1,10 @@
+Example 542
+......
+
+[foo *bar [baz][ref]*][ref]
+
+[ref]: /uri
+
+......
+
+<p>[foo <em>bar <a href="/uri">baz</a></em>]<a href="/uri">ref</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_543.md b/crates/gfm/tests/fixtures/spec_543.md
new file mode 100644
index 0000000..5c52112
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_543.md
@@ -0,0 +1,10 @@
+Example 543
+......
+
+*[foo*][ref]
+
+[ref]: /uri
+
+......
+
+<p>*<a href="/uri">foo*</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_544.md b/crates/gfm/tests/fixtures/spec_544.md
new file mode 100644
index 0000000..b18931e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_544.md
@@ -0,0 +1,10 @@
+Example 544
+......
+
+[foo *bar][ref]
+
+[ref]: /uri
+
+......
+
+<p><a href="/uri">foo *bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_545.md b/crates/gfm/tests/fixtures/spec_545.md
new file mode 100644
index 0000000..a54c184
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_545.md
@@ -0,0 +1,10 @@
+Example 545
+......
+
+[foo <bar attr="][ref]">
+
+[ref]: /uri
+
+......
+
+<p>[foo <bar attr="][ref]"></p>
diff --git a/crates/gfm/tests/fixtures/spec_546.md b/crates/gfm/tests/fixtures/spec_546.md
new file mode 100644
index 0000000..f50bbc3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_546.md
@@ -0,0 +1,10 @@
+Example 546
+......
+
+[foo`][ref]`
+
+[ref]: /uri
+
+......
+
+<p>[foo<code>][ref]</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_547.md b/crates/gfm/tests/fixtures/spec_547.md
new file mode 100644
index 0000000..f5a7c56
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_547.md
@@ -0,0 +1,10 @@
+Example 547
+......
+
+[foo<http://example.com/?search=][ref]>
+
+[ref]: /uri
+
+......
+
+<p>[foo<a href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_548.md b/crates/gfm/tests/fixtures/spec_548.md
new file mode 100644
index 0000000..28fd21e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_548.md
@@ -0,0 +1,10 @@
+Example 548
+......
+
+[foo][BaR]
+
+[bar]: /url "title"
+
+......
+
+<p><a href="/url" title="title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_549.md b/crates/gfm/tests/fixtures/spec_549.md
new file mode 100644
index 0000000..7a8d06f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_549.md
@@ -0,0 +1,10 @@
+Example 549
+......
+
+[Толпой][Толпой] is a Russian word.
+
+[ТОЛПОЙ]: /url
+
+......
+
+<p><a href="/url">Толпой</a> is a Russian word.</p>
diff --git a/crates/gfm/tests/fixtures/spec_550.md b/crates/gfm/tests/fixtures/spec_550.md
new file mode 100644
index 0000000..727b6c7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_550.md
@@ -0,0 +1,11 @@
+Example 550
+......
+
+[Foo
+  bar]: /url
+
+[Baz][Foo bar]
+
+......
+
+<p><a href="/url">Baz</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_551.md b/crates/gfm/tests/fixtures/spec_551.md
new file mode 100644
index 0000000..6d0cdc9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_551.md
@@ -0,0 +1,10 @@
+Example 551
+......
+
+[foo] [bar]
+
+[bar]: /url "title"
+
+......
+
+<p>[foo] <a href="/url" title="title">bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_552.md b/crates/gfm/tests/fixtures/spec_552.md
new file mode 100644
index 0000000..412dbb8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_552.md
@@ -0,0 +1,12 @@
+Example 552
+......
+
+[foo]
+[bar]
+
+[bar]: /url "title"
+
+......
+
+<p>[foo]
+<a href="/url" title="title">bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_553.md b/crates/gfm/tests/fixtures/spec_553.md
new file mode 100644
index 0000000..451a2db
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_553.md
@@ -0,0 +1,12 @@
+Example 553
+......
+
+[foo]: /url1
+
+[foo]: /url2
+
+[bar][foo]
+
+......
+
+<p><a href="/url1">bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_554.md b/crates/gfm/tests/fixtures/spec_554.md
new file mode 100644
index 0000000..4c91a31
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_554.md
@@ -0,0 +1,10 @@
+Example 554
+......
+
+[bar][foo\!]
+
+[foo!]: /url
+
+......
+
+<p>[bar][foo!]</p>
diff --git a/crates/gfm/tests/fixtures/spec_555.md b/crates/gfm/tests/fixtures/spec_555.md
new file mode 100644
index 0000000..9803b45
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_555.md
@@ -0,0 +1,11 @@
+Example 555
+......
+
+[foo][ref[]
+
+[ref[]: /uri
+
+......
+
+<p>[foo][ref[]</p>
+<p>[ref[]: /uri</p>
diff --git a/crates/gfm/tests/fixtures/spec_556.md b/crates/gfm/tests/fixtures/spec_556.md
new file mode 100644
index 0000000..79ab885
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_556.md
@@ -0,0 +1,11 @@
+Example 556
+......
+
+[foo][ref[bar]]
+
+[ref[bar]]: /uri
+
+......
+
+<p>[foo][ref[bar]]</p>
+<p>[ref[bar]]: /uri</p>
diff --git a/crates/gfm/tests/fixtures/spec_557.md b/crates/gfm/tests/fixtures/spec_557.md
new file mode 100644
index 0000000..d8a22e2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_557.md
@@ -0,0 +1,11 @@
+Example 557
+......
+
+[[[foo]]]
+
+[[[foo]]]: /url
+
+......
+
+<p>[[[foo]]]</p>
+<p>[[[foo]]]: /url</p>
diff --git a/crates/gfm/tests/fixtures/spec_558.md b/crates/gfm/tests/fixtures/spec_558.md
new file mode 100644
index 0000000..3e9def3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_558.md
@@ -0,0 +1,10 @@
+Example 558
+......
+
+[foo][ref\[]
+
+[ref\[]: /uri
+
+......
+
+<p><a href="/uri">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_559.md b/crates/gfm/tests/fixtures/spec_559.md
new file mode 100644
index 0000000..2566ce6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_559.md
@@ -0,0 +1,10 @@
+Example 559
+......
+
+[bar\\]: /uri
+
+[bar\\]
+
+......
+
+<p><a href="/uri">bar\</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_560.md b/crates/gfm/tests/fixtures/spec_560.md
new file mode 100644
index 0000000..b80a3aa
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_560.md
@@ -0,0 +1,11 @@
+Example 560
+......
+
+[]
+
+[]: /uri
+
+......
+
+<p>[]</p>
+<p>[]: /uri</p>
diff --git a/crates/gfm/tests/fixtures/spec_561.md b/crates/gfm/tests/fixtures/spec_561.md
new file mode 100644
index 0000000..849c8dc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_561.md
@@ -0,0 +1,15 @@
+Example 561
+......
+
+[
+ ]
+
+[
+ ]: /uri
+
+......
+
+<p>[
+]</p>
+<p>[
+]: /uri</p>
diff --git a/crates/gfm/tests/fixtures/spec_562.md b/crates/gfm/tests/fixtures/spec_562.md
new file mode 100644
index 0000000..4e948d9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_562.md
@@ -0,0 +1,10 @@
+Example 562
+......
+
+[foo][]
+
+[foo]: /url "title"
+
+......
+
+<p><a href="/url" title="title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_563.md b/crates/gfm/tests/fixtures/spec_563.md
new file mode 100644
index 0000000..68eaa6b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_563.md
@@ -0,0 +1,10 @@
+Example 563
+......
+
+[*foo* bar][]
+
+[*foo* bar]: /url "title"
+
+......
+
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_564.md b/crates/gfm/tests/fixtures/spec_564.md
new file mode 100644
index 0000000..b18923d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_564.md
@@ -0,0 +1,10 @@
+Example 564
+......
+
+[Foo][]
+
+[foo]: /url "title"
+
+......
+
+<p><a href="/url" title="title">Foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_565.md b/crates/gfm/tests/fixtures/spec_565.md
new file mode 100644
index 0000000..fb59b40
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_565.md
@@ -0,0 +1,12 @@
+Example 565
+......
+
+[foo] 
+[]
+
+[foo]: /url "title"
+
+......
+
+<p><a href="/url" title="title">foo</a>
+[]</p>
diff --git a/crates/gfm/tests/fixtures/spec_566.md b/crates/gfm/tests/fixtures/spec_566.md
new file mode 100644
index 0000000..73b060f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_566.md
@@ -0,0 +1,10 @@
+Example 566
+......
+
+[foo]
+
+[foo]: /url "title"
+
+......
+
+<p><a href="/url" title="title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_567.md b/crates/gfm/tests/fixtures/spec_567.md
new file mode 100644
index 0000000..c9bc827
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_567.md
@@ -0,0 +1,10 @@
+Example 567
+......
+
+[*foo* bar]
+
+[*foo* bar]: /url "title"
+
+......
+
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_568.md b/crates/gfm/tests/fixtures/spec_568.md
new file mode 100644
index 0000000..06801bf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_568.md
@@ -0,0 +1,10 @@
+Example 568
+......
+
+[[*foo* bar]]
+
+[*foo* bar]: /url "title"
+
+......
+
+<p>[<a href="/url" title="title"><em>foo</em> bar</a>]</p>
diff --git a/crates/gfm/tests/fixtures/spec_569.md b/crates/gfm/tests/fixtures/spec_569.md
new file mode 100644
index 0000000..928d3e4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_569.md
@@ -0,0 +1,10 @@
+Example 569
+......
+
+[[bar [foo]
+
+[foo]: /url
+
+......
+
+<p>[[bar <a href="/url">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_570.md b/crates/gfm/tests/fixtures/spec_570.md
new file mode 100644
index 0000000..ec43b39
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_570.md
@@ -0,0 +1,10 @@
+Example 570
+......
+
+[Foo]
+
+[foo]: /url "title"
+
+......
+
+<p><a href="/url" title="title">Foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_571.md b/crates/gfm/tests/fixtures/spec_571.md
new file mode 100644
index 0000000..e292c16
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_571.md
@@ -0,0 +1,10 @@
+Example 571
+......
+
+[foo] bar
+
+[foo]: /url
+
+......
+
+<p><a href="/url">foo</a> bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_572.md b/crates/gfm/tests/fixtures/spec_572.md
new file mode 100644
index 0000000..ae82be8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_572.md
@@ -0,0 +1,10 @@
+Example 572
+......
+
+\[foo]
+
+[foo]: /url "title"
+
+......
+
+<p>[foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_573.md b/crates/gfm/tests/fixtures/spec_573.md
new file mode 100644
index 0000000..a590f0f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_573.md
@@ -0,0 +1,10 @@
+Example 573
+......
+
+[foo*]: /url
+
+*[foo*]
+
+......
+
+<p>*<a href="/url">foo*</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_574.md b/crates/gfm/tests/fixtures/spec_574.md
new file mode 100644
index 0000000..02076b0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_574.md
@@ -0,0 +1,11 @@
+Example 574
+......
+
+[foo][bar]
+
+[foo]: /url1
+[bar]: /url2
+
+......
+
+<p><a href="/url2">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_575.md b/crates/gfm/tests/fixtures/spec_575.md
new file mode 100644
index 0000000..d0a11e6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_575.md
@@ -0,0 +1,10 @@
+Example 575
+......
+
+[foo][]
+
+[foo]: /url1
+
+......
+
+<p><a href="/url1">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_576.md b/crates/gfm/tests/fixtures/spec_576.md
new file mode 100644
index 0000000..642b412
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_576.md
@@ -0,0 +1,10 @@
+Example 576
+......
+
+[foo]()
+
+[foo]: /url1
+
+......
+
+<p><a href="">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_577.md b/crates/gfm/tests/fixtures/spec_577.md
new file mode 100644
index 0000000..086b5ee
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_577.md
@@ -0,0 +1,10 @@
+Example 577
+......
+
+[foo](not a link)
+
+[foo]: /url1
+
+......
+
+<p><a href="/url1">foo</a>(not a link)</p>
diff --git a/crates/gfm/tests/fixtures/spec_578.md b/crates/gfm/tests/fixtures/spec_578.md
new file mode 100644
index 0000000..a178fef
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_578.md
@@ -0,0 +1,10 @@
+Example 578
+......
+
+[foo][bar][baz]
+
+[baz]: /url
+
+......
+
+<p>[foo]<a href="/url">bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_579.md b/crates/gfm/tests/fixtures/spec_579.md
new file mode 100644
index 0000000..a96f94e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_579.md
@@ -0,0 +1,11 @@
+Example 579
+......
+
+[foo][bar][baz]
+
+[baz]: /url1
+[bar]: /url2
+
+......
+
+<p><a href="/url2">foo</a><a href="/url1">baz</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_580.md b/crates/gfm/tests/fixtures/spec_580.md
new file mode 100644
index 0000000..f95deb4
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_580.md
@@ -0,0 +1,11 @@
+Example 580
+......
+
+[foo][bar][baz]
+
+[baz]: /url1
+[foo]: /url2
+
+......
+
+<p>[foo]<a href="/url1">bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_581.md b/crates/gfm/tests/fixtures/spec_581.md
new file mode 100644
index 0000000..b167eca
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_581.md
@@ -0,0 +1,8 @@
+Example 581
+......
+
+![foo](/url "title")
+
+......
+
+<p><img src="/url" alt="foo" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_582.md b/crates/gfm/tests/fixtures/spec_582.md
new file mode 100644
index 0000000..85b9bfa
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_582.md
@@ -0,0 +1,10 @@
+Example 582
+......
+
+![foo *bar*]
+
+[foo *bar*]: train.jpg "train & tracks"
+
+......
+
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_583.md b/crates/gfm/tests/fixtures/spec_583.md
new file mode 100644
index 0000000..0755abe
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_583.md
@@ -0,0 +1,8 @@
+Example 583
+......
+
+![foo ![bar](/url)](/url2)
+
+......
+
+<p><img src="/url2" alt="foo bar" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_584.md b/crates/gfm/tests/fixtures/spec_584.md
new file mode 100644
index 0000000..ab653d3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_584.md
@@ -0,0 +1,8 @@
+Example 584
+......
+
+![foo [bar](/url)](/url2)
+
+......
+
+<p><img src="/url2" alt="foo bar" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_585.md b/crates/gfm/tests/fixtures/spec_585.md
new file mode 100644
index 0000000..3bb13c9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_585.md
@@ -0,0 +1,10 @@
+Example 585
+......
+
+![foo *bar*][]
+
+[foo *bar*]: train.jpg "train & tracks"
+
+......
+
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_586.md b/crates/gfm/tests/fixtures/spec_586.md
new file mode 100644
index 0000000..cc2bb25
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_586.md
@@ -0,0 +1,10 @@
+Example 586
+......
+
+![foo *bar*][foobar]
+
+[FOOBAR]: train.jpg "train & tracks"
+
+......
+
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_587.md b/crates/gfm/tests/fixtures/spec_587.md
new file mode 100644
index 0000000..5fbfd21
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_587.md
@@ -0,0 +1,8 @@
+Example 587
+......
+
+![foo](train.jpg)
+
+......
+
+<p><img src="train.jpg" alt="foo" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_588.md b/crates/gfm/tests/fixtures/spec_588.md
new file mode 100644
index 0000000..94a6ef1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_588.md
@@ -0,0 +1,8 @@
+Example 588
+......
+
+My ![foo bar](/path/to/train.jpg  "title"   )
+
+......
+
+<p>My <img src="/path/to/train.jpg" alt="foo bar" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_589.md b/crates/gfm/tests/fixtures/spec_589.md
new file mode 100644
index 0000000..f522adf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_589.md
@@ -0,0 +1,8 @@
+Example 589
+......
+
+![foo](<url>)
+
+......
+
+<p><img src="url" alt="foo" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_590.md b/crates/gfm/tests/fixtures/spec_590.md
new file mode 100644
index 0000000..53639a0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_590.md
@@ -0,0 +1,8 @@
+Example 590
+......
+
+![](/url)
+
+......
+
+<p><img src="/url" alt="" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_591.md b/crates/gfm/tests/fixtures/spec_591.md
new file mode 100644
index 0000000..9df1b14
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_591.md
@@ -0,0 +1,10 @@
+Example 591
+......
+
+![foo][bar]
+
+[bar]: /url
+
+......
+
+<p><img src="/url" alt="foo" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_592.md b/crates/gfm/tests/fixtures/spec_592.md
new file mode 100644
index 0000000..70137a5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_592.md
@@ -0,0 +1,10 @@
+Example 592
+......
+
+![foo][bar]
+
+[BAR]: /url
+
+......
+
+<p><img src="/url" alt="foo" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_593.md b/crates/gfm/tests/fixtures/spec_593.md
new file mode 100644
index 0000000..6ba20eb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_593.md
@@ -0,0 +1,10 @@
+Example 593
+......
+
+![foo][]
+
+[foo]: /url "title"
+
+......
+
+<p><img src="/url" alt="foo" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_594.md b/crates/gfm/tests/fixtures/spec_594.md
new file mode 100644
index 0000000..1a328e2
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_594.md
@@ -0,0 +1,10 @@
+Example 594
+......
+
+![*foo* bar][]
+
+[*foo* bar]: /url "title"
+
+......
+
+<p><img src="/url" alt="foo bar" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_595.md b/crates/gfm/tests/fixtures/spec_595.md
new file mode 100644
index 0000000..813b58c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_595.md
@@ -0,0 +1,10 @@
+Example 595
+......
+
+![Foo][]
+
+[foo]: /url "title"
+
+......
+
+<p><img src="/url" alt="Foo" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_596.md b/crates/gfm/tests/fixtures/spec_596.md
new file mode 100644
index 0000000..7eb68cd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_596.md
@@ -0,0 +1,12 @@
+Example 596
+......
+
+![foo] 
+[]
+
+[foo]: /url "title"
+
+......
+
+<p><img src="/url" alt="foo" title="title" />
+[]</p>
diff --git a/crates/gfm/tests/fixtures/spec_597.md b/crates/gfm/tests/fixtures/spec_597.md
new file mode 100644
index 0000000..50ec8eb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_597.md
@@ -0,0 +1,10 @@
+Example 597
+......
+
+![foo]
+
+[foo]: /url "title"
+
+......
+
+<p><img src="/url" alt="foo" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_598.md b/crates/gfm/tests/fixtures/spec_598.md
new file mode 100644
index 0000000..d629f8e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_598.md
@@ -0,0 +1,10 @@
+Example 598
+......
+
+![*foo* bar]
+
+[*foo* bar]: /url "title"
+
+......
+
+<p><img src="/url" alt="foo bar" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_599.md b/crates/gfm/tests/fixtures/spec_599.md
new file mode 100644
index 0000000..f841231
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_599.md
@@ -0,0 +1,11 @@
+Example 599
+......
+
+![[foo]]
+
+[[foo]]: /url "title"
+
+......
+
+<p>![[foo]]</p>
+<p>[[foo]]: /url &quot;title&quot;</p>
diff --git a/crates/gfm/tests/fixtures/spec_600.md b/crates/gfm/tests/fixtures/spec_600.md
new file mode 100644
index 0000000..c194be6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_600.md
@@ -0,0 +1,10 @@
+Example 600
+......
+
+![Foo]
+
+[foo]: /url "title"
+
+......
+
+<p><img src="/url" alt="Foo" title="title" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_601.md b/crates/gfm/tests/fixtures/spec_601.md
new file mode 100644
index 0000000..5fa64d5
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_601.md
@@ -0,0 +1,10 @@
+Example 601
+......
+
+!\[foo]
+
+[foo]: /url "title"
+
+......
+
+<p>![foo]</p>
diff --git a/crates/gfm/tests/fixtures/spec_602.md b/crates/gfm/tests/fixtures/spec_602.md
new file mode 100644
index 0000000..d674ce3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_602.md
@@ -0,0 +1,10 @@
+Example 602
+......
+
+\![foo]
+
+[foo]: /url "title"
+
+......
+
+<p>!<a href="/url" title="title">foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_603.md b/crates/gfm/tests/fixtures/spec_603.md
new file mode 100644
index 0000000..897a966
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_603.md
@@ -0,0 +1,8 @@
+Example 603
+......
+
+<http://foo.bar.baz>
+
+......
+
+<p><a href="http://foo.bar.baz">http://foo.bar.baz</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_604.md b/crates/gfm/tests/fixtures/spec_604.md
new file mode 100644
index 0000000..660e486
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_604.md
@@ -0,0 +1,8 @@
+Example 604
+......
+
+<http://foo.bar.baz/test?q=hello&id=22&boolean>
+
+......
+
+<p><a href="http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean">http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_605.md b/crates/gfm/tests/fixtures/spec_605.md
new file mode 100644
index 0000000..272b0be
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_605.md
@@ -0,0 +1,8 @@
+Example 605
+......
+
+<irc://foo.bar:2233/baz>
+
+......
+
+<p><a href="irc://foo.bar:2233/baz">irc://foo.bar:2233/baz</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_606.md b/crates/gfm/tests/fixtures/spec_606.md
new file mode 100644
index 0000000..fc59e54
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_606.md
@@ -0,0 +1,8 @@
+Example 606
+......
+
+<MAILTO:FOO@BAR.BAZ>
+
+......
+
+<p><a href="MAILTO:FOO@BAR.BAZ">MAILTO:FOO@BAR.BAZ</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_607.md b/crates/gfm/tests/fixtures/spec_607.md
new file mode 100644
index 0000000..da8f84b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_607.md
@@ -0,0 +1,8 @@
+Example 607
+......
+
+<a+b+c:d>
+
+......
+
+<p><a href="a+b+c:d">a+b+c:d</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_608.md b/crates/gfm/tests/fixtures/spec_608.md
new file mode 100644
index 0000000..c9aa500
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_608.md
@@ -0,0 +1,8 @@
+Example 608
+......
+
+<made-up-scheme://foo,bar>
+
+......
+
+<p><a href="made-up-scheme://foo,bar">made-up-scheme://foo,bar</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_609.md b/crates/gfm/tests/fixtures/spec_609.md
new file mode 100644
index 0000000..183bc57
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_609.md
@@ -0,0 +1,8 @@
+Example 609
+......
+
+<http://../>
+
+......
+
+<p><a href="http://../">http://../</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_610.md b/crates/gfm/tests/fixtures/spec_610.md
new file mode 100644
index 0000000..0bd2a33
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_610.md
@@ -0,0 +1,8 @@
+Example 610
+......
+
+<localhost:5001/foo>
+
+......
+
+<p><a href="localhost:5001/foo">localhost:5001/foo</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_611.md b/crates/gfm/tests/fixtures/spec_611.md
new file mode 100644
index 0000000..1a3f5c3
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_611.md
@@ -0,0 +1,8 @@
+Example 611
+......
+
+<http://foo.bar/baz bim>
+
+......
+
+<p>&lt;http://foo.bar/baz bim&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_612.md b/crates/gfm/tests/fixtures/spec_612.md
new file mode 100644
index 0000000..f918c8b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_612.md
@@ -0,0 +1,8 @@
+Example 612
+......
+
+<http://example.com/\[\>
+
+......
+
+<p><a href="http://example.com/%5C%5B%5C">http://example.com/\[\</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_613.md b/crates/gfm/tests/fixtures/spec_613.md
new file mode 100644
index 0000000..fcfcadd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_613.md
@@ -0,0 +1,8 @@
+Example 613
+......
+
+<foo@bar.example.com>
+
+......
+
+<p><a href="mailto:foo@bar.example.com">foo@bar.example.com</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_614.md b/crates/gfm/tests/fixtures/spec_614.md
new file mode 100644
index 0000000..4512577
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_614.md
@@ -0,0 +1,8 @@
+Example 614
+......
+
+<foo+special@Bar.baz-bar0.com>
+
+......
+
+<p><a href="mailto:foo+special@Bar.baz-bar0.com">foo+special@Bar.baz-bar0.com</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_615.md b/crates/gfm/tests/fixtures/spec_615.md
new file mode 100644
index 0000000..7044bea
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_615.md
@@ -0,0 +1,8 @@
+Example 615
+......
+
+<foo\+@bar.example.com>
+
+......
+
+<p>&lt;foo+@bar.example.com&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_616.md b/crates/gfm/tests/fixtures/spec_616.md
new file mode 100644
index 0000000..05ea8ed
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_616.md
@@ -0,0 +1,8 @@
+Example 616
+......
+
+<>
+
+......
+
+<p>&lt;&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_618.md b/crates/gfm/tests/fixtures/spec_618.md
new file mode 100644
index 0000000..4d6b80e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_618.md
@@ -0,0 +1,8 @@
+Example 618
+......
+
+<m:abc>
+
+......
+
+<p>&lt;m:abc&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_619.md b/crates/gfm/tests/fixtures/spec_619.md
new file mode 100644
index 0000000..f060d04
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_619.md
@@ -0,0 +1,8 @@
+Example 619
+......
+
+<foo.bar.baz>
+
+......
+
+<p>&lt;foo.bar.baz&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_622.md b/crates/gfm/tests/fixtures/spec_622.md
new file mode 100644
index 0000000..e0ad1a1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_622.md
@@ -0,0 +1,8 @@
+Example 622
+......
+
+www.commonmark.org
+
+......
+
+<p><a href="http://www.commonmark.org">www.commonmark.org</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_623.md b/crates/gfm/tests/fixtures/spec_623.md
new file mode 100644
index 0000000..9226549
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_623.md
@@ -0,0 +1,8 @@
+Example 623
+......
+
+Visit www.commonmark.org/help for more information.
+
+......
+
+<p>Visit <a href="http://www.commonmark.org/help">www.commonmark.org/help</a> for more information.</p>
diff --git a/crates/gfm/tests/fixtures/spec_624.md b/crates/gfm/tests/fixtures/spec_624.md
new file mode 100644
index 0000000..3947743
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_624.md
@@ -0,0 +1,11 @@
+Example 624
+......
+
+Visit www.commonmark.org.
+
+Visit www.commonmark.org/a.b.
+
+......
+
+<p>Visit <a href="http://www.commonmark.org">www.commonmark.org</a>.</p>
+<p>Visit <a href="http://www.commonmark.org/a.b">www.commonmark.org/a.b</a>.</p>
diff --git a/crates/gfm/tests/fixtures/spec_625.md b/crates/gfm/tests/fixtures/spec_625.md
new file mode 100644
index 0000000..f1b25bb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_625.md
@@ -0,0 +1,17 @@
+Example 625
+......
+
+www.google.com/search?q=Markup+(business)
+
+www.google.com/search?q=Markup+(business)))
+
+(www.google.com/search?q=Markup+(business))
+
+(www.google.com/search?q=Markup+(business)
+
+......
+
+<p><a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a></p>
+<p><a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a>))</p>
+<p>(<a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a>)</p>
+<p>(<a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_626.md b/crates/gfm/tests/fixtures/spec_626.md
new file mode 100644
index 0000000..2a547c6
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_626.md
@@ -0,0 +1,8 @@
+Example 626
+......
+
+www.google.com/search?q=(business))+ok
+
+......
+
+<p><a href="http://www.google.com/search?q=(business))+ok">www.google.com/search?q=(business))+ok</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_627.md b/crates/gfm/tests/fixtures/spec_627.md
new file mode 100644
index 0000000..698d0fb
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_627.md
@@ -0,0 +1,11 @@
+Example 627
+......
+
+www.google.com/search?q=commonmark&hl=en
+
+www.google.com/search?q=commonmark&hl;
+
+......
+
+<p><a href="http://www.google.com/search?q=commonmark&amp;hl=en">www.google.com/search?q=commonmark&amp;hl=en</a></p>
+<p><a href="http://www.google.com/search?q=commonmark">www.google.com/search?q=commonmark</a>&amp;hl;</p>
diff --git a/crates/gfm/tests/fixtures/spec_628.md b/crates/gfm/tests/fixtures/spec_628.md
new file mode 100644
index 0000000..daa159e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_628.md
@@ -0,0 +1,8 @@
+Example 628
+......
+
+www.commonmark.org/he<lp
+
+......
+
+<p><a href="http://www.commonmark.org/he">www.commonmark.org/he</a>&lt;lp</p>
diff --git a/crates/gfm/tests/fixtures/spec_629.md b/crates/gfm/tests/fixtures/spec_629.md
new file mode 100644
index 0000000..0b46102
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_629.md
@@ -0,0 +1,11 @@
+Example 629
+......
+
+http://commonmark.org
+
+(Visit https://encrypted.google.com/search?q=Markup+(business))
+
+......
+
+<p><a href="http://commonmark.org">http://commonmark.org</a></p>
+<p>(Visit <a href="https://encrypted.google.com/search?q=Markup+(business)">https://encrypted.google.com/search?q=Markup+(business)</a>)</p>
diff --git a/crates/gfm/tests/fixtures/spec_630.md b/crates/gfm/tests/fixtures/spec_630.md
new file mode 100644
index 0000000..bbfab21
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_630.md
@@ -0,0 +1,8 @@
+Example 630
+......
+
+foo@bar.baz
+
+......
+
+<p><a href="mailto:foo@bar.baz">foo@bar.baz</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_631.md b/crates/gfm/tests/fixtures/spec_631.md
new file mode 100644
index 0000000..cf26fe8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_631.md
@@ -0,0 +1,8 @@
+Example 631
+......
+
+hello@mail+xyz.example isn't valid, but hello+xyz@mail.example is.
+
+......
+
+<p>hello@mail+xyz.example isn't valid, but <a href="mailto:hello+xyz@mail.example">hello+xyz@mail.example</a> is.</p>
diff --git a/crates/gfm/tests/fixtures/spec_633.md b/crates/gfm/tests/fixtures/spec_633.md
new file mode 100644
index 0000000..67429f8
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_633.md
@@ -0,0 +1,29 @@
+Example 633
+......
+
+mailto:foo@bar.baz
+
+mailto:a.b-c_d@a.b
+
+mailto:a.b-c_d@a.b.
+
+mailto:a.b-c_d@a.b/
+
+mailto:a.b-c_d@a.b-
+
+mailto:a.b-c_d@a.b_
+
+xmpp:foo@bar.baz
+
+xmpp:foo@bar.baz.
+
+......
+
+<p><a href="mailto:foo@bar.baz">mailto:foo@bar.baz</a></p>
+<p><a href="mailto:a.b-c_d@a.b">mailto:a.b-c_d@a.b</a></p>
+<p><a href="mailto:a.b-c_d@a.b">mailto:a.b-c_d@a.b</a>.</p>
+<p><a href="mailto:a.b-c_d@a.b">mailto:a.b-c_d@a.b</a>/</p>
+<p>mailto:a.b-c_d@a.b-</p>
+<p>mailto:a.b-c_d@a.b_</p>
+<p><a href="xmpp:foo@bar.baz">xmpp:foo@bar.baz</a></p>
+<p><a href="xmpp:foo@bar.baz">xmpp:foo@bar.baz</a>.</p>
diff --git a/crates/gfm/tests/fixtures/spec_634.md b/crates/gfm/tests/fixtures/spec_634.md
new file mode 100644
index 0000000..584b3c7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_634.md
@@ -0,0 +1,14 @@
+Example 634
+......
+
+xmpp:foo@bar.baz/txt
+
+xmpp:foo@bar.baz/txt@bin
+
+xmpp:foo@bar.baz/txt@bin.com
+
+......
+
+<p><a href="xmpp:foo@bar.baz/txt">xmpp:foo@bar.baz/txt</a></p>
+<p><a href="xmpp:foo@bar.baz/txt@bin">xmpp:foo@bar.baz/txt@bin</a></p>
+<p><a href="xmpp:foo@bar.baz/txt@bin.com">xmpp:foo@bar.baz/txt@bin.com</a></p>
diff --git a/crates/gfm/tests/fixtures/spec_635.md b/crates/gfm/tests/fixtures/spec_635.md
new file mode 100644
index 0000000..956c5b0
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_635.md
@@ -0,0 +1,8 @@
+Example 635
+......
+
+xmpp:foo@bar.baz/txt/bin
+
+......
+
+<p><a href="xmpp:foo@bar.baz/txt">xmpp:foo@bar.baz/txt</a>/bin</p>
diff --git a/crates/gfm/tests/fixtures/spec_636.md b/crates/gfm/tests/fixtures/spec_636.md
new file mode 100644
index 0000000..a3ff56e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_636.md
@@ -0,0 +1,8 @@
+Example 636
+......
+
+<a><bab><c2c>
+
+......
+
+<p><a><bab><c2c></p>
diff --git a/crates/gfm/tests/fixtures/spec_637.md b/crates/gfm/tests/fixtures/spec_637.md
new file mode 100644
index 0000000..5839550
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_637.md
@@ -0,0 +1,8 @@
+Example 637
+......
+
+<a/><b2/>
+
+......
+
+<p><a/><b2/></p>
diff --git a/crates/gfm/tests/fixtures/spec_638.md b/crates/gfm/tests/fixtures/spec_638.md
new file mode 100644
index 0000000..9641d2c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_638.md
@@ -0,0 +1,10 @@
+Example 638
+......
+
+<a  /><b2
+data="foo" >
+
+......
+
+<p><a  /><b2
+data="foo" ></p>
diff --git a/crates/gfm/tests/fixtures/spec_639.md b/crates/gfm/tests/fixtures/spec_639.md
new file mode 100644
index 0000000..4fc14fc
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_639.md
@@ -0,0 +1,10 @@
+Example 639
+......
+
+<a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 />
+
+......
+
+<p><a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 /></p>
diff --git a/crates/gfm/tests/fixtures/spec_640.md b/crates/gfm/tests/fixtures/spec_640.md
new file mode 100644
index 0000000..d2d64d9
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_640.md
@@ -0,0 +1,8 @@
+Example 640
+......
+
+Foo <responsive-image src="foo.jpg" />
+
+......
+
+<p>Foo <responsive-image src="foo.jpg" /></p>
diff --git a/crates/gfm/tests/fixtures/spec_641.md b/crates/gfm/tests/fixtures/spec_641.md
new file mode 100644
index 0000000..c066eab
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_641.md
@@ -0,0 +1,8 @@
+Example 641
+......
+
+<33> <__>
+
+......
+
+<p>&lt;33&gt; &lt;__&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_642.md b/crates/gfm/tests/fixtures/spec_642.md
new file mode 100644
index 0000000..f90c264
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_642.md
@@ -0,0 +1,8 @@
+Example 642
+......
+
+<a h*#ref="hi">
+
+......
+
+<p>&lt;a h*#ref=&quot;hi&quot;&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_643.md b/crates/gfm/tests/fixtures/spec_643.md
new file mode 100644
index 0000000..9f90f4e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_643.md
@@ -0,0 +1,8 @@
+Example 643
+......
+
+<a href="hi'> <a href=hi'>
+
+......
+
+<p>&lt;a href=&quot;hi'&gt; &lt;a href=hi'&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_644.md b/crates/gfm/tests/fixtures/spec_644.md
new file mode 100644
index 0000000..974929a
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_644.md
@@ -0,0 +1,14 @@
+Example 644
+......
+
+< a><
+foo><bar/ >
+<foo bar=baz
+bim!bop />
+
+......
+
+<p>&lt; a&gt;&lt;
+foo&gt;&lt;bar/ &gt;
+&lt;foo bar=baz
+bim!bop /&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_645.md b/crates/gfm/tests/fixtures/spec_645.md
new file mode 100644
index 0000000..df12b33
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_645.md
@@ -0,0 +1,8 @@
+Example 645
+......
+
+<a href='bar'title=title>
+
+......
+
+<p>&lt;a href='bar'title=title&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_646.md b/crates/gfm/tests/fixtures/spec_646.md
new file mode 100644
index 0000000..43d82dd
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_646.md
@@ -0,0 +1,8 @@
+Example 646
+......
+
+</a></foo >
+
+......
+
+<p></a></foo ></p>
diff --git a/crates/gfm/tests/fixtures/spec_647.md b/crates/gfm/tests/fixtures/spec_647.md
new file mode 100644
index 0000000..1967775
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_647.md
@@ -0,0 +1,8 @@
+Example 647
+......
+
+</a href="foo">
+
+......
+
+<p>&lt;/a href=&quot;foo&quot;&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_648.md b/crates/gfm/tests/fixtures/spec_648.md
new file mode 100644
index 0000000..964f179
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_648.md
@@ -0,0 +1,10 @@
+Example 648
+......
+
+foo <!-- this is a
+comment - with hyphen -->
+
+......
+
+<p>foo <!-- this is a
+comment - with hyphen --></p>
diff --git a/crates/gfm/tests/fixtures/spec_649.md b/crates/gfm/tests/fixtures/spec_649.md
new file mode 100644
index 0000000..8c6911f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_649.md
@@ -0,0 +1,8 @@
+Example 649
+......
+
+foo <!-- not a comment -- two hyphens -->
+
+......
+
+<p>foo &lt;!-- not a comment -- two hyphens --&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_650.md b/crates/gfm/tests/fixtures/spec_650.md
new file mode 100644
index 0000000..f6cbaaf
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_650.md
@@ -0,0 +1,11 @@
+Example 650
+......
+
+foo <!--> foo -->
+
+foo <!-- foo--->
+
+......
+
+<p>foo &lt;!--&gt; foo --&gt;</p>
+<p>foo &lt;!-- foo---&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_651.md b/crates/gfm/tests/fixtures/spec_651.md
new file mode 100644
index 0000000..ae97300
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_651.md
@@ -0,0 +1,8 @@
+Example 651
+......
+
+foo <?php echo $a; ?>
+
+......
+
+<p>foo <?php echo $a; ?></p>
diff --git a/crates/gfm/tests/fixtures/spec_652.md b/crates/gfm/tests/fixtures/spec_652.md
new file mode 100644
index 0000000..7fcc064
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_652.md
@@ -0,0 +1,8 @@
+Example 652
+......
+
+foo <!ELEMENT br EMPTY>
+
+......
+
+<p>foo <!ELEMENT br EMPTY></p>
diff --git a/crates/gfm/tests/fixtures/spec_653.md b/crates/gfm/tests/fixtures/spec_653.md
new file mode 100644
index 0000000..698e372
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_653.md
@@ -0,0 +1,8 @@
+Example 653
+......
+
+foo <![CDATA[>&<]]>
+
+......
+
+<p>foo <![CDATA[>&<]]></p>
diff --git a/crates/gfm/tests/fixtures/spec_654.md b/crates/gfm/tests/fixtures/spec_654.md
new file mode 100644
index 0000000..266f8fa
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_654.md
@@ -0,0 +1,8 @@
+Example 654
+......
+
+foo <a href="&ouml;">
+
+......
+
+<p>foo <a href="&ouml;"></p>
diff --git a/crates/gfm/tests/fixtures/spec_655.md b/crates/gfm/tests/fixtures/spec_655.md
new file mode 100644
index 0000000..e54edc7
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_655.md
@@ -0,0 +1,8 @@
+Example 655
+......
+
+foo <a href="\*">
+
+......
+
+<p>foo <a href="\*"></p>
diff --git a/crates/gfm/tests/fixtures/spec_656.md b/crates/gfm/tests/fixtures/spec_656.md
new file mode 100644
index 0000000..01fb78c
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_656.md
@@ -0,0 +1,8 @@
+Example 656
+......
+
+<a href="\"">
+
+......
+
+<p>&lt;a href=&quot;&quot;&quot;&gt;</p>
diff --git a/crates/gfm/tests/fixtures/spec_657.md b/crates/gfm/tests/fixtures/spec_657.md
new file mode 100644
index 0000000..0377809
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_657.md
@@ -0,0 +1,15 @@
+Example 657
+......
+
+<strong> <title> <style> <em>
+
+<blockquote>
+  <xmp> is disallowed.  <XMP> is also disallowed.
+</blockquote>
+
+......
+
+<p><strong> &lt;title> &lt;style> <em></p>
+<blockquote>
+  &lt;xmp> is disallowed.  &lt;XMP> is also disallowed.
+</blockquote>
diff --git a/crates/gfm/tests/fixtures/spec_658.md b/crates/gfm/tests/fixtures/spec_658.md
new file mode 100644
index 0000000..dadc11d
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_658.md
@@ -0,0 +1,10 @@
+Example 658
+......
+
+foo  
+baz
+
+......
+
+<p>foo<br />
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_659.md b/crates/gfm/tests/fixtures/spec_659.md
new file mode 100644
index 0000000..24c2e95
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_659.md
@@ -0,0 +1,10 @@
+Example 659
+......
+
+foo\
+baz
+
+......
+
+<p>foo<br />
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_660.md b/crates/gfm/tests/fixtures/spec_660.md
new file mode 100644
index 0000000..460e2de
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_660.md
@@ -0,0 +1,10 @@
+Example 660
+......
+
+foo       
+baz
+
+......
+
+<p>foo<br />
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_661.md b/crates/gfm/tests/fixtures/spec_661.md
new file mode 100644
index 0000000..399ab45
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_661.md
@@ -0,0 +1,10 @@
+Example 661
+......
+
+foo  
+     bar
+
+......
+
+<p>foo<br />
+bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_662.md b/crates/gfm/tests/fixtures/spec_662.md
new file mode 100644
index 0000000..8957188
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_662.md
@@ -0,0 +1,10 @@
+Example 662
+......
+
+foo\
+     bar
+
+......
+
+<p>foo<br />
+bar</p>
diff --git a/crates/gfm/tests/fixtures/spec_663.md b/crates/gfm/tests/fixtures/spec_663.md
new file mode 100644
index 0000000..d21d485
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_663.md
@@ -0,0 +1,10 @@
+Example 663
+......
+
+*foo  
+bar*
+
+......
+
+<p><em>foo<br />
+bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_664.md b/crates/gfm/tests/fixtures/spec_664.md
new file mode 100644
index 0000000..cbb0536
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_664.md
@@ -0,0 +1,10 @@
+Example 664
+......
+
+*foo\
+bar*
+
+......
+
+<p><em>foo<br />
+bar</em></p>
diff --git a/crates/gfm/tests/fixtures/spec_665.md b/crates/gfm/tests/fixtures/spec_665.md
new file mode 100644
index 0000000..c5f3932
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_665.md
@@ -0,0 +1,9 @@
+Example 665
+......
+
+`code  
+span`
+
+......
+
+<p><code>code   span</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_666.md b/crates/gfm/tests/fixtures/spec_666.md
new file mode 100644
index 0000000..bc8b262
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_666.md
@@ -0,0 +1,9 @@
+Example 666
+......
+
+`code\
+span`
+
+......
+
+<p><code>code\ span</code></p>
diff --git a/crates/gfm/tests/fixtures/spec_667.md b/crates/gfm/tests/fixtures/spec_667.md
new file mode 100644
index 0000000..a490dea
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_667.md
@@ -0,0 +1,10 @@
+Example 667
+......
+
+<a href="foo  
+bar">
+
+......
+
+<p><a href="foo  
+bar"></p>
diff --git a/crates/gfm/tests/fixtures/spec_668.md b/crates/gfm/tests/fixtures/spec_668.md
new file mode 100644
index 0000000..04e683f
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_668.md
@@ -0,0 +1,10 @@
+Example 668
+......
+
+<a href="foo\
+bar">
+
+......
+
+<p><a href="foo\
+bar"></p>
diff --git a/crates/gfm/tests/fixtures/spec_669.md b/crates/gfm/tests/fixtures/spec_669.md
new file mode 100644
index 0000000..efa26e1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_669.md
@@ -0,0 +1,8 @@
+Example 669
+......
+
+foo\
+
+......
+
+<p>foo\</p>
diff --git a/crates/gfm/tests/fixtures/spec_670.md b/crates/gfm/tests/fixtures/spec_670.md
new file mode 100644
index 0000000..b5aa0ee
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_670.md
@@ -0,0 +1,8 @@
+Example 670
+......
+
+foo  
+
+......
+
+<p>foo</p>
diff --git a/crates/gfm/tests/fixtures/spec_671.md b/crates/gfm/tests/fixtures/spec_671.md
new file mode 100644
index 0000000..e78e7d1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_671.md
@@ -0,0 +1,8 @@
+Example 671
+......
+
+### foo\
+
+......
+
+<h3>foo\</h3>
diff --git a/crates/gfm/tests/fixtures/spec_672.md b/crates/gfm/tests/fixtures/spec_672.md
new file mode 100644
index 0000000..04d4631
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_672.md
@@ -0,0 +1,8 @@
+Example 672
+......
+
+### foo  
+
+......
+
+<h3>foo</h3>
diff --git a/crates/gfm/tests/fixtures/spec_673.md b/crates/gfm/tests/fixtures/spec_673.md
new file mode 100644
index 0000000..b3f739b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_673.md
@@ -0,0 +1,10 @@
+Example 673
+......
+
+foo
+baz
+
+......
+
+<p>foo
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_674.md b/crates/gfm/tests/fixtures/spec_674.md
new file mode 100644
index 0000000..f5b145b
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_674.md
@@ -0,0 +1,10 @@
+Example 674
+......
+
+foo 
+ baz
+
+......
+
+<p>foo
+baz</p>
diff --git a/crates/gfm/tests/fixtures/spec_675.md b/crates/gfm/tests/fixtures/spec_675.md
new file mode 100644
index 0000000..c9f779e
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_675.md
@@ -0,0 +1,8 @@
+Example 675
+......
+
+hello $.;'there
+
+......
+
+<p>hello $.;'there</p>
diff --git a/crates/gfm/tests/fixtures/spec_676.md b/crates/gfm/tests/fixtures/spec_676.md
new file mode 100644
index 0000000..d28dba1
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_676.md
@@ -0,0 +1,8 @@
+Example 676
+......
+
+Foo χρῆν
+
+......
+
+<p>Foo χρῆν</p>
diff --git a/crates/gfm/tests/fixtures/spec_677.md b/crates/gfm/tests/fixtures/spec_677.md
new file mode 100644
index 0000000..9312092
--- /dev/null
+++ b/crates/gfm/tests/fixtures/spec_677.md
@@ -0,0 +1,8 @@
+Example 677
+......
+
+Multiple     spaces
+
+......
+
+<p>Multiple     spaces</p>
diff --git a/crates/gfm/tests/gen_fixtures.py b/crates/gfm/tests/gen_fixtures.py
new file mode 100644
index 0000000..240b4e0
--- /dev/null
+++ b/crates/gfm/tests/gen_fixtures.py
@@ -0,0 +1,42 @@
+"""Simple script to generate the separate test fixtures from the full spec.txt file.
+
+From: https://github.com/github/cmark-gfm/blob/master/test/spec.txt
+
+Note: https://github.com/github/cmark-gfm/issues/288
+"""
+from pathlib import Path
+import re
+
+if __name__ == "__main__":
+    spec = (Path(__file__).parent / "spec.txt").read_text("utf8").splitlines()
+    tests = []
+    pat = re.compile(r"^[`]{3,}\s*example")
+    while spec:
+        line = spec.pop(0)
+        if pat.match(line):
+            line = spec.pop(0)
+            md, html = [], []
+            in_md = True
+            while not line.startswith("`" * 10):
+                if line == ".":
+                    in_md = False
+                    line = spec.pop(0)
+                    continue
+                if in_md:
+                    md.append(line)
+                else:
+                    html.append(line)
+                line = spec.pop(0)
+            assert not in_md
+            tests.append((md, html))
+
+    for i, (md, html) in enumerate(tests, 1):
+        (Path(__file__).parent / "fixtures").mkdir(exist_ok=True)
+        filename = f"spec_{i:03}.md"
+        if i in (491, 617, 620, 621):
+            # these examples clash with the GFM extensions
+            continue
+        md_text = '\n'.join(md)
+        html_text = '\n'.join(html)
+        text = f"Example {i}\n......\n\n{md_text}\n\n......\n\n{html_text}\n"
+        (Path(__file__).parent / "fixtures" / filename).write_text(text, "utf8")
diff --git a/crates/gfm/tests/spec.txt b/crates/gfm/tests/spec.txt
new file mode 100644
index 0000000..4d11fe2
--- /dev/null
+++ b/crates/gfm/tests/spec.txt
@@ -0,0 +1,10281 @@
+---
+title: GitHub Flavored Markdown Spec
+version: 0.29
+date: '2019-04-06'
+license: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
+...
+
+# Introduction
+
+## What is GitHub Flavored Markdown?
+
+GitHub Flavored Markdown, often shortened as GFM, is the dialect of Markdown
+that is currently supported for user content on GitHub.com and GitHub
+Enterprise.
+
+This formal specification, based on the CommonMark Spec, defines the syntax and
+semantics of this dialect.
+
+GFM is a strict superset of CommonMark. All the features which are supported in
+GitHub user content and that are not specified on the original CommonMark Spec
+are hence known as **extensions**, and highlighted as such.
+
+While GFM supports a wide range of inputs, it's worth noting that GitHub.com
+and GitHub Enterprise perform additional post-processing and sanitization after
+GFM is converted to HTML to ensure security and consistency of the website.
+
+## What is Markdown?
+
+Markdown is a plain text format for writing structured documents,
+based on conventions for indicating formatting in email
+and usenet posts.  It was developed by John Gruber (with
+help from Aaron Swartz) and released in 2004 in the form of a
+[syntax description](http://daringfireball.net/projects/markdown/syntax)
+and a Perl script (`Markdown.pl`) for converting Markdown to
+HTML.  In the next decade, dozens of implementations were
+developed in many languages.  Some extended the original
+Markdown syntax with conventions for footnotes, tables, and
+other document elements.  Some allowed Markdown documents to be
+rendered in formats other than HTML.  Websites like Reddit,
+StackOverflow, and GitHub had millions of people using Markdown.
+And Markdown started to be used beyond the web, to author books,
+articles, slide shows, letters, and lecture notes.
+
+What distinguishes Markdown from many other lightweight markup
+syntaxes, which are often easier to write, is its readability.
+As Gruber writes:
+
+> The overriding design goal for Markdown's formatting syntax is
+> to make it as readable as possible. The idea is that a
+> Markdown-formatted document should be publishable as-is, as
+> plain text, without looking like it's been marked up with tags
+> or formatting instructions.
+> (<http://daringfireball.net/projects/markdown/>)
+
+The point can be illustrated by comparing a sample of
+[AsciiDoc](http://www.methods.co.nz/asciidoc/) with
+an equivalent sample of Markdown.  Here is a sample of
+AsciiDoc from the AsciiDoc manual:
+
+```
+1. List item one.
++
+List item one continued with a second paragraph followed by an
+Indented block.
++
+.................
+$ ls *.sh
+$ mv *.sh ~/tmp
+.................
++
+List item continued with a third paragraph.
+
+2. List item two continued with an open block.
++
+--
+This paragraph is part of the preceding list item.
+
+a. This list is nested and does not require explicit item
+continuation.
++
+This paragraph is part of the preceding list item.
+
+b. List item b.
+
+This paragraph belongs to item two of the outer list.
+--
+```
+
+And here is the equivalent in Markdown:
+```
+1.  List item one.
+
+    List item one continued with a second paragraph followed by an
+    Indented block.
+
+        $ ls *.sh
+        $ mv *.sh ~/tmp
+
+    List item continued with a third paragraph.
+
+2.  List item two continued with an open block.
+
+    This paragraph is part of the preceding list item.
+
+    1. This list is nested and does not require explicit item continuation.
+
+       This paragraph is part of the preceding list item.
+
+    2. List item b.
+
+    This paragraph belongs to item two of the outer list.
+```
+
+The AsciiDoc version is, arguably, easier to write. You don't need
+to worry about indentation.  But the Markdown version is much easier
+to read.  The nesting of list items is apparent to the eye in the
+source, not just in the processed document.
+
+## Why is a spec needed?
+
+John Gruber's [canonical description of Markdown's
+syntax](http://daringfireball.net/projects/markdown/syntax)
+does not specify the syntax unambiguously.  Here are some examples of
+questions it does not answer:
+
+1.  How much indentation is needed for a sublist?  The spec says that
+    continuation paragraphs need to be indented four spaces, but is
+    not fully explicit about sublists.  It is natural to think that
+    they, too, must be indented four spaces, but `Markdown.pl` does
+    not require that.  This is hardly a "corner case," and divergences
+    between implementations on this issue often lead to surprises for
+    users in real documents. (See [this comment by John
+    Gruber](http://article.gmane.org/gmane.text.markdown.general/1997).)
+
+2.  Is a blank line needed before a block quote or heading?
+    Most implementations do not require the blank line.  However,
+    this can lead to unexpected results in hard-wrapped text, and
+    also to ambiguities in parsing (note that some implementations
+    put the heading inside the blockquote, while others do not).
+    (John Gruber has also spoken [in favor of requiring the blank
+    lines](http://article.gmane.org/gmane.text.markdown.general/2146).)
+
+3.  Is a blank line needed before an indented code block?
+    (`Markdown.pl` requires it, but this is not mentioned in the
+    documentation, and some implementations do not require it.)
+
+    ``` markdown
+    paragraph
+        code?
+    ```
+
+4.  What is the exact rule for determining when list items get
+    wrapped in `<p>` tags?  Can a list be partially "loose" and partially
+    "tight"?  What should we do with a list like this?
+
+    ``` markdown
+    1. one
+
+    2. two
+    3. three
+    ```
+
+    Or this?
+
+    ``` markdown
+    1.  one
+        - a
+
+        - b
+    2.  two
+    ```
+
+    (There are some relevant comments by John Gruber
+    [here](http://article.gmane.org/gmane.text.markdown.general/2554).)
+
+5.  Can list markers be indented?  Can ordered list markers be right-aligned?
+
+    ``` markdown
+     8. item 1
+     9. item 2
+    10. item 2a
+    ```
+
+6.  Is this one list with a thematic break in its second item,
+    or two lists separated by a thematic break?
+
+    ``` markdown
+    * a
+    * * * * *
+    * b
+    ```
+
+7.  When list markers change from numbers to bullets, do we have
+    two lists or one?  (The Markdown syntax description suggests two,
+    but the perl scripts and many other implementations produce one.)
+
+    ``` markdown
+    1. fee
+    2. fie
+    -  foe
+    -  fum
+    ```
+
+8.  What are the precedence rules for the markers of inline structure?
+    For example, is the following a valid link, or does the code span
+    take precedence ?
+
+    ``` markdown
+    [a backtick (`)](/url) and [another backtick (`)](/url).
+    ```
+
+9.  What are the precedence rules for markers of emphasis and strong
+    emphasis?  For example, how should the following be parsed?
+
+    ``` markdown
+    *foo *bar* baz*
+    ```
+
+10. What are the precedence rules between block-level and inline-level
+    structure?  For example, how should the following be parsed?
+
+    ``` markdown
+    - `a long code span can contain a hyphen like this
+      - and it can screw things up`
+    ```
+
+11. Can list items include section headings?  (`Markdown.pl` does not
+    allow this, but does allow blockquotes to include headings.)
+
+    ``` markdown
+    - # Heading
+    ```
+
+12. Can list items be empty?
+
+    ``` markdown
+    * a
+    *
+    * b
+    ```
+
+13. Can link references be defined inside block quotes or list items?
+
+    ``` markdown
+    > Blockquote [foo].
+    >
+    > [foo]: /url
+    ```
+
+14. If there are multiple definitions for the same reference, which takes
+    precedence?
+
+    ``` markdown
+    [foo]: /url1
+    [foo]: /url2
+
+    [foo][]
+    ```
+
+In the absence of a spec, early implementers consulted `Markdown.pl`
+to resolve these ambiguities.  But `Markdown.pl` was quite buggy, and
+gave manifestly bad results in many cases, so it was not a
+satisfactory replacement for a spec.
+
+Because there is no unambiguous spec, implementations have diverged
+considerably.  As a result, users are often surprised to find that
+a document that renders one way on one system (say, a GitHub wiki)
+renders differently on another (say, converting to docbook using
+pandoc).  To make matters worse, because nothing in Markdown counts
+as a "syntax error," the divergence often isn't discovered right away.
+
+## About this document
+
+This document attempts to specify Markdown syntax unambiguously.
+It contains many examples with side-by-side Markdown and
+HTML.  These are intended to double as conformance tests.  An
+accompanying script `spec_tests.py` can be used to run the tests
+against any Markdown program:
+
+    python test/spec_tests.py --spec spec.txt --program PROGRAM
+
+Since this document describes how Markdown is to be parsed into
+an abstract syntax tree, it would have made sense to use an abstract
+representation of the syntax tree instead of HTML.  But HTML is capable
+of representing the structural distinctions we need to make, and the
+choice of HTML for the tests makes it possible to run the tests against
+an implementation without writing an abstract syntax tree renderer.
+
+This document is generated from a text file, `spec.txt`, written
+in Markdown with a small extension for the side-by-side tests.
+The script `tools/makespec.py` can be used to convert `spec.txt` into
+HTML or CommonMark (which can then be converted into other formats).
+
+In the examples, the `→` character is used to represent tabs.
+
+# Preliminaries
+
+## Characters and lines
+
+Any sequence of [characters] is a valid CommonMark
+document.
+
+A [character](@) is a Unicode code point.  Although some
+code points (for example, combining accents) do not correspond to
+characters in an intuitive sense, all code points count as characters
+for purposes of this spec.
+
+This spec does not specify an encoding; it thinks of lines as composed
+of [characters] rather than bytes.  A conforming parser may be limited
+to a certain encoding.
+
+A [line](@) is a sequence of zero or more [characters]
+other than newline (`U+000A`) or carriage return (`U+000D`),
+followed by a [line ending] or by the end of file.
+
+A [line ending](@) is a newline (`U+000A`), a carriage return
+(`U+000D`) not followed by a newline, or a carriage return and a
+following newline.
+
+A line containing no characters, or a line containing only spaces
+(`U+0020`) or tabs (`U+0009`), is called a [blank line](@).
+
+The following definitions of character classes will be used in this spec:
+
+A [whitespace character](@) is a space
+(`U+0020`), tab (`U+0009`), newline (`U+000A`), line tabulation (`U+000B`),
+form feed (`U+000C`), or carriage return (`U+000D`).
+
+[Whitespace](@) is a sequence of one or more [whitespace
+characters].
+
+A [Unicode whitespace character](@) is
+any code point in the Unicode `Zs` general category, or a tab (`U+0009`),
+carriage return (`U+000D`), newline (`U+000A`), or form feed
+(`U+000C`).
+
+[Unicode whitespace](@) is a sequence of one
+or more [Unicode whitespace characters].
+
+A [space](@) is `U+0020`.
+
+A [non-whitespace character](@) is any character
+that is not a [whitespace character].
+
+An [ASCII punctuation character](@)
+is `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`,
+`*`, `+`, `,`, `-`, `.`, `/` (U+0021–2F),
+`:`, `;`, `<`, `=`, `>`, `?`, `@` (U+003A–0040),
+`[`, `\`, `]`, `^`, `_`, `` ` `` (U+005B–0060),
+`{`, `|`, `}`, or `~` (U+007B–007E).
+
+A [punctuation character](@) is an [ASCII
+punctuation character] or anything in
+the general Unicode categories  `Pc`, `Pd`, `Pe`, `Pf`, `Pi`, `Po`, or `Ps`.
+
+## Tabs
+
+Tabs in lines are not expanded to [spaces].  However,
+in contexts where whitespace helps to define block structure,
+tabs behave as if they were replaced by spaces with a tab stop
+of 4 characters.
+
+Thus, for example, a tab can be used instead of four spaces
+in an indented code block.  (Note, however, that internal
+tabs are passed through as literal tabs, not expanded to
+spaces.)
+
+```````````````````````````````` example
+	foo	baz		bim
+.
+<pre><code>foo	baz		bim
+</code></pre>
+````````````````````````````````
+
+```````````````````````````````` example
+  	foo	baz		bim
+.
+<pre><code>foo	baz		bim
+</code></pre>
+````````````````````````````````
+
+```````````````````````````````` example
+    a	a
+    ὐ	a
+.
+<pre><code>a	a
+ὐ	a
+</code></pre>
+````````````````````````````````
+
+In the following example, a continuation paragraph of a list
+item is indented with a tab; this has exactly the same effect
+as indentation with four spaces would:
+
+```````````````````````````````` example
+  - foo
+
+	bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+- foo
+
+		bar
+.
+<ul>
+<li>
+<p>foo</p>
+<pre><code>  bar
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+Normally the `>` that begins a block quote may be followed
+optionally by a space, which is not considered part of the
+content.  In the following case `>` is followed by a tab,
+which is treated as if it were expanded into three spaces.
+Since one of these spaces is considered part of the
+delimiter, `foo` is considered to be indented six spaces
+inside the block quote context, so we get an indented
+code block starting with two spaces.
+
+```````````````````````````````` example
+>		foo
+.
+<blockquote>
+<pre><code>  foo
+</code></pre>
+</blockquote>
+````````````````````````````````
+
+```````````````````````````````` example
+-		foo
+.
+<ul>
+<li>
+<pre><code>  foo
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    foo
+	bar
+.
+<pre><code>foo
+bar
+</code></pre>
+````````````````````````````````
+
+```````````````````````````````` example
+ - foo
+   - bar
+	 - baz
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+#	Foo
+.
+<h1>Foo</h1>
+````````````````````````````````
+
+```````````````````````````````` example
+*	*	*
+.
+<hr />
+````````````````````````````````
+
+
+## Insecure characters
+
+For security reasons, the Unicode character `U+0000` must be replaced
+with the REPLACEMENT CHARACTER (`U+FFFD`).
+
+# Blocks and inlines
+
+We can think of a document as a sequence of
+[blocks](@)---structural elements like paragraphs, block
+quotations, lists, headings, rules, and code blocks.  Some blocks (like
+block quotes and list items) contain other blocks; others (like
+headings and paragraphs) contain [inline](@) content---text,
+links, emphasized text, images, code spans, and so on.
+
+## Precedence
+
+Indicators of block structure always take precedence over indicators
+of inline structure.  So, for example, the following is a list with
+two items, not a list with one item containing a code span:
+
+```````````````````````````````` example
+- `one
+- two`
+.
+<ul>
+<li>`one</li>
+<li>two`</li>
+</ul>
+````````````````````````````````
+
+
+This means that parsing can proceed in two steps:  first, the block
+structure of the document can be discerned; second, text lines inside
+paragraphs, headings, and other block constructs can be parsed for inline
+structure.  The second step requires information about link reference
+definitions that will be available only at the end of the first
+step.  Note that the first step requires processing lines in sequence,
+but the second can be parallelized, since the inline parsing of
+one block element does not affect the inline parsing of any other.
+
+## Container blocks and leaf blocks
+
+We can divide blocks into two types:
+[container blocks](@),
+which can contain other blocks, and [leaf blocks](@),
+which cannot.
+
+# Leaf blocks
+
+This section describes the different kinds of leaf block that make up a
+Markdown document.
+
+## Thematic breaks
+
+A line consisting of 0-3 spaces of indentation, followed by a sequence
+of three or more matching `-`, `_`, or `*` characters, each followed
+optionally by any number of spaces or tabs, forms a
+[thematic break](@).
+
+```````````````````````````````` example
+***
+---
+___
+.
+<hr />
+<hr />
+<hr />
+````````````````````````````````
+
+
+Wrong characters:
+
+```````````````````````````````` example
++++
+.
+<p>+++</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+===
+.
+<p>===</p>
+````````````````````````````````
+
+
+Not enough characters:
+
+```````````````````````````````` example
+--
+**
+__
+.
+<p>--
+**
+__</p>
+````````````````````````````````
+
+
+One to three spaces indent are allowed:
+
+```````````````````````````````` example
+ ***
+  ***
+   ***
+.
+<hr />
+<hr />
+<hr />
+````````````````````````````````
+
+
+Four spaces is too many:
+
+```````````````````````````````` example
+    ***
+.
+<pre><code>***
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+Foo
+    ***
+.
+<p>Foo
+***</p>
+````````````````````````````````
+
+
+More than three characters may be used:
+
+```````````````````````````````` example
+_____________________________________
+.
+<hr />
+````````````````````````````````
+
+
+Spaces are allowed between the characters:
+
+```````````````````````````````` example
+ - - -
+.
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+ **  * ** * ** * **
+.
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+-     -      -      -
+.
+<hr />
+````````````````````````````````
+
+
+Spaces are allowed at the end:
+
+```````````````````````````````` example
+- - - -
+.
+<hr />
+````````````````````````````````
+
+
+However, no other characters may occur in the line:
+
+```````````````````````````````` example
+_ _ _ _ a
+
+a------
+
+---a---
+.
+<p>_ _ _ _ a</p>
+<p>a------</p>
+<p>---a---</p>
+````````````````````````````````
+
+
+It is required that all of the [non-whitespace characters] be the same.
+So, this is not a thematic break:
+
+```````````````````````````````` example
+ *-*
+.
+<p><em>-</em></p>
+````````````````````````````````
+
+
+Thematic breaks do not need blank lines before or after:
+
+```````````````````````````````` example
+- foo
+***
+- bar
+.
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+<ul>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+Thematic breaks can interrupt a paragraph:
+
+```````````````````````````````` example
+Foo
+***
+bar
+.
+<p>Foo</p>
+<hr />
+<p>bar</p>
+````````````````````````````````
+
+
+If a line of dashes that meets the above conditions for being a
+thematic break could also be interpreted as the underline of a [setext
+heading], the interpretation as a
+[setext heading] takes precedence. Thus, for example,
+this is a setext heading, not a paragraph followed by a thematic break:
+
+```````````````````````````````` example
+Foo
+---
+bar
+.
+<h2>Foo</h2>
+<p>bar</p>
+````````````````````````````````
+
+
+When both a thematic break and a list item are possible
+interpretations of a line, the thematic break takes precedence:
+
+```````````````````````````````` example
+* Foo
+* * *
+* Bar
+.
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+<ul>
+<li>Bar</li>
+</ul>
+````````````````````````````````
+
+
+If you want a thematic break in a list item, use a different bullet:
+
+```````````````````````````````` example
+- Foo
+- * * *
+.
+<ul>
+<li>Foo</li>
+<li>
+<hr />
+</li>
+</ul>
+````````````````````````````````
+
+
+## ATX headings
+
+An [ATX heading](@)
+consists of a string of characters, parsed as inline content, between an
+opening sequence of 1--6 unescaped `#` characters and an optional
+closing sequence of any number of unescaped `#` characters.
+The opening sequence of `#` characters must be followed by a
+[space] or by the end of line. The optional closing sequence of `#`s must be
+preceded by a [space] and may be followed by spaces only.  The opening
+`#` character may be indented 0-3 spaces.  The raw contents of the
+heading are stripped of leading and trailing spaces before being parsed
+as inline content.  The heading level is equal to the number of `#`
+characters in the opening sequence.
+
+Simple headings:
+
+```````````````````````````````` example
+# foo
+## foo
+### foo
+#### foo
+##### foo
+###### foo
+.
+<h1>foo</h1>
+<h2>foo</h2>
+<h3>foo</h3>
+<h4>foo</h4>
+<h5>foo</h5>
+<h6>foo</h6>
+````````````````````````````````
+
+
+More than six `#` characters is not a heading:
+
+```````````````````````````````` example
+####### foo
+.
+<p>####### foo</p>
+````````````````````````````````
+
+
+At least one space is required between the `#` characters and the
+heading's contents, unless the heading is empty.  Note that many
+implementations currently do not require the space.  However, the
+space was required by the
+[original ATX implementation](http://www.aaronsw.com/2002/atx/atx.py),
+and it helps prevent things like the following from being parsed as
+headings:
+
+```````````````````````````````` example
+#5 bolt
+
+#hashtag
+.
+<p>#5 bolt</p>
+<p>#hashtag</p>
+````````````````````````````````
+
+
+This is not a heading, because the first `#` is escaped:
+
+```````````````````````````````` example
+\## foo
+.
+<p>## foo</p>
+````````````````````````````````
+
+
+Contents are parsed as inlines:
+
+```````````````````````````````` example
+# foo *bar* \*baz\*
+.
+<h1>foo <em>bar</em> *baz*</h1>
+````````````````````````````````
+
+
+Leading and trailing [whitespace] is ignored in parsing inline content:
+
+```````````````````````````````` example
+#                  foo
+.
+<h1>foo</h1>
+````````````````````````````````
+
+
+One to three spaces indentation are allowed:
+
+```````````````````````````````` example
+ ### foo
+  ## foo
+   # foo
+.
+<h3>foo</h3>
+<h2>foo</h2>
+<h1>foo</h1>
+````````````````````````````````
+
+
+Four spaces are too much:
+
+```````````````````````````````` example
+    # foo
+.
+<pre><code># foo
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo
+    # bar
+.
+<p>foo
+# bar</p>
+````````````````````````````````
+
+
+A closing sequence of `#` characters is optional:
+
+```````````````````````````````` example
+## foo ##
+  ###   bar    ###
+.
+<h2>foo</h2>
+<h3>bar</h3>
+````````````````````````````````
+
+
+It need not be the same length as the opening sequence:
+
+```````````````````````````````` example
+# foo ##################################
+##### foo ##
+.
+<h1>foo</h1>
+<h5>foo</h5>
+````````````````````````````````
+
+
+Spaces are allowed after the closing sequence:
+
+```````````````````````````````` example
+### foo ###
+.
+<h3>foo</h3>
+````````````````````````````````
+
+
+A sequence of `#` characters with anything but [spaces] following it
+is not a closing sequence, but counts as part of the contents of the
+heading:
+
+```````````````````````````````` example
+### foo ### b
+.
+<h3>foo ### b</h3>
+````````````````````````````````
+
+
+The closing sequence must be preceded by a space:
+
+```````````````````````````````` example
+# foo#
+.
+<h1>foo#</h1>
+````````````````````````````````
+
+
+Backslash-escaped `#` characters do not count as part
+of the closing sequence:
+
+```````````````````````````````` example
+### foo \###
+## foo #\##
+# foo \#
+.
+<h3>foo ###</h3>
+<h2>foo ###</h2>
+<h1>foo #</h1>
+````````````````````````````````
+
+
+ATX headings need not be separated from surrounding content by blank
+lines, and they can interrupt paragraphs:
+
+```````````````````````````````` example
+****
+## foo
+****
+.
+<hr />
+<h2>foo</h2>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+Foo bar
+# baz
+Bar foo
+.
+<p>Foo bar</p>
+<h1>baz</h1>
+<p>Bar foo</p>
+````````````````````````````````
+
+
+ATX headings can be empty:
+
+```````````````````````````````` example
+##
+#
+### ###
+.
+<h2></h2>
+<h1></h1>
+<h3></h3>
+````````````````````````````````
+
+
+## Setext headings
+
+A [setext heading](@) consists of one or more
+lines of text, each containing at least one [non-whitespace
+character], with no more than 3 spaces indentation, followed by
+a [setext heading underline].  The lines of text must be such
+that, were they not followed by the setext heading underline,
+they would be interpreted as a paragraph:  they cannot be
+interpretable as a [code fence], [ATX heading][ATX headings],
+[block quote][block quotes], [thematic break][thematic breaks],
+[list item][list items], or [HTML block][HTML blocks].
+
+A [setext heading underline](@) is a sequence of
+`=` characters or a sequence of `-` characters, with no more than 3
+spaces indentation and any number of trailing spaces.  If a line
+containing a single `-` can be interpreted as an
+empty [list items], it should be interpreted this way
+and not as a [setext heading underline].
+
+The heading is a level 1 heading if `=` characters are used in
+the [setext heading underline], and a level 2 heading if `-`
+characters are used.  The contents of the heading are the result
+of parsing the preceding lines of text as CommonMark inline
+content.
+
+In general, a setext heading need not be preceded or followed by a
+blank line.  However, it cannot interrupt a paragraph, so when a
+setext heading comes after a paragraph, a blank line is needed between
+them.
+
+Simple examples:
+
+```````````````````````````````` example
+Foo *bar*
+=========
+
+Foo *bar*
+---------
+.
+<h1>Foo <em>bar</em></h1>
+<h2>Foo <em>bar</em></h2>
+````````````````````````````````
+
+
+The content of the header may span more than one line:
+
+```````````````````````````````` example
+Foo *bar
+baz*
+====
+.
+<h1>Foo <em>bar
+baz</em></h1>
+````````````````````````````````
+
+The contents are the result of parsing the headings's raw
+content as inlines.  The heading's raw content is formed by
+concatenating the lines and removing initial and final
+[whitespace].
+
+```````````````````````````````` example
+  Foo *bar
+baz*
+====
+.
+<h1>Foo <em>bar
+baz</em></h1>
+````````````````````````````````
+
+
+The underlining can be any length:
+
+```````````````````````````````` example
+Foo
+-------------------------
+
+Foo
+=
+.
+<h2>Foo</h2>
+<h1>Foo</h1>
+````````````````````````````````
+
+
+The heading content can be indented up to three spaces, and need
+not line up with the underlining:
+
+```````````````````````````````` example
+   Foo
+---
+
+  Foo
+-----
+
+  Foo
+  ===
+.
+<h2>Foo</h2>
+<h2>Foo</h2>
+<h1>Foo</h1>
+````````````````````````````````
+
+
+Four spaces indent is too much:
+
+```````````````````````````````` example
+    Foo
+    ---
+
+    Foo
+---
+.
+<pre><code>Foo
+---
+
+Foo
+</code></pre>
+<hr />
+````````````````````````````````
+
+
+The setext heading underline can be indented up to three spaces, and
+may have trailing spaces:
+
+```````````````````````````````` example
+Foo
+   ----
+.
+<h2>Foo</h2>
+````````````````````````````````
+
+
+Four spaces is too much:
+
+```````````````````````````````` example
+Foo
+    ---
+.
+<p>Foo
+---</p>
+````````````````````````````````
+
+
+The setext heading underline cannot contain internal spaces:
+
+```````````````````````````````` example
+Foo
+= =
+
+Foo
+--- -
+.
+<p>Foo
+= =</p>
+<p>Foo</p>
+<hr />
+````````````````````````````````
+
+
+Trailing spaces in the content line do not cause a line break:
+
+```````````````````````````````` example
+Foo
+-----
+.
+<h2>Foo</h2>
+````````````````````````````````
+
+
+Nor does a backslash at the end:
+
+```````````````````````````````` example
+Foo\
+----
+.
+<h2>Foo\</h2>
+````````````````````````````````
+
+
+Since indicators of block structure take precedence over
+indicators of inline structure, the following are setext headings:
+
+```````````````````````````````` example
+`Foo
+----
+`
+
+<a title="a lot
+---
+of dashes"/>
+.
+<h2>`Foo</h2>
+<p>`</p>
+<h2>&lt;a title=&quot;a lot</h2>
+<p>of dashes&quot;/&gt;</p>
+````````````````````````````````
+
+
+The setext heading underline cannot be a [lazy continuation
+line] in a list item or block quote:
+
+```````````````````````````````` example
+> Foo
+---
+.
+<blockquote>
+<p>Foo</p>
+</blockquote>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+> foo
+bar
+===
+.
+<blockquote>
+<p>foo
+bar
+===</p>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- Foo
+---
+.
+<ul>
+<li>Foo</li>
+</ul>
+<hr />
+````````````````````````````````
+
+
+A blank line is needed between a paragraph and a following
+setext heading, since otherwise the paragraph becomes part
+of the heading's content:
+
+```````````````````````````````` example
+Foo
+Bar
+---
+.
+<h2>Foo
+Bar</h2>
+````````````````````````````````
+
+
+But in general a blank line is not required before or after
+setext headings:
+
+```````````````````````````````` example
+---
+Foo
+---
+Bar
+---
+Baz
+.
+<hr />
+<h2>Foo</h2>
+<h2>Bar</h2>
+<p>Baz</p>
+````````````````````````````````
+
+
+Setext headings cannot be empty:
+
+```````````````````````````````` example
+
+====
+.
+<p>====</p>
+````````````````````````````````
+
+
+Setext heading text lines must not be interpretable as block
+constructs other than paragraphs.  So, the line of dashes
+in these examples gets interpreted as a thematic break:
+
+```````````````````````````````` example
+---
+---
+.
+<hr />
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+- foo
+-----
+.
+<ul>
+<li>foo</li>
+</ul>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+    foo
+---
+.
+<pre><code>foo
+</code></pre>
+<hr />
+````````````````````````````````
+
+
+```````````````````````````````` example
+> foo
+-----
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
+````````````````````````````````
+
+
+If you want a heading with `> foo` as its literal text, you can
+use backslash escapes:
+
+```````````````````````````````` example
+\> foo
+------
+.
+<h2>&gt; foo</h2>
+````````````````````````````````
+
+
+**Compatibility note:**  Most existing Markdown implementations
+do not allow the text of setext headings to span multiple lines.
+But there is no consensus about how to interpret
+
+``` markdown
+Foo
+bar
+---
+baz
+```
+
+One can find four different interpretations:
+
+1. paragraph "Foo", heading "bar", paragraph "baz"
+2. paragraph "Foo bar", thematic break, paragraph "baz"
+3. paragraph "Foo bar --- baz"
+4. heading "Foo bar", paragraph "baz"
+
+We find interpretation 4 most natural, and interpretation 4
+increases the expressive power of CommonMark, by allowing
+multiline headings.  Authors who want interpretation 1 can
+put a blank line after the first paragraph:
+
+```````````````````````````````` example
+Foo
+
+bar
+---
+baz
+.
+<p>Foo</p>
+<h2>bar</h2>
+<p>baz</p>
+````````````````````````````````
+
+
+Authors who want interpretation 2 can put blank lines around
+the thematic break,
+
+```````````````````````````````` example
+Foo
+bar
+
+---
+
+baz
+.
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
+````````````````````````````````
+
+
+or use a thematic break that cannot count as a [setext heading
+underline], such as
+
+```````````````````````````````` example
+Foo
+bar
+* * *
+baz
+.
+<p>Foo
+bar</p>
+<hr />
+<p>baz</p>
+````````````````````````````````
+
+
+Authors who want interpretation 3 can use backslash escapes:
+
+```````````````````````````````` example
+Foo
+bar
+\---
+baz
+.
+<p>Foo
+bar
+---
+baz</p>
+````````````````````````````````
+
+
+## Indented code blocks
+
+An [indented code block](@) is composed of one or more
+[indented chunks] separated by blank lines.
+An [indented chunk](@) is a sequence of non-blank lines,
+each indented four or more spaces. The contents of the code block are
+the literal contents of the lines, including trailing
+[line endings], minus four spaces of indentation.
+An indented code block has no [info string].
+
+An indented code block cannot interrupt a paragraph, so there must be
+a blank line between a paragraph and a following indented code block.
+(A blank line is not needed, however, between a code block and a following
+paragraph.)
+
+```````````````````````````````` example
+    a simple
+      indented code block
+.
+<pre><code>a simple
+  indented code block
+</code></pre>
+````````````````````````````````
+
+
+If there is any ambiguity between an interpretation of indentation
+as a code block and as indicating that material belongs to a [list
+item][list items], the list item interpretation takes precedence:
+
+```````````````````````````````` example
+  - foo
+
+    bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1.  foo
+
+    - bar
+.
+<ol>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
+````````````````````````````````
+
+
+
+The contents of a code block are literal text, and do not get parsed
+as Markdown:
+
+```````````````````````````````` example
+    <a/>
+    *hi*
+
+    - one
+.
+<pre><code>&lt;a/&gt;
+*hi*
+
+- one
+</code></pre>
+````````````````````````````````
+
+
+Here we have three chunks separated by blank lines:
+
+```````````````````````````````` example
+    chunk1
+
+    chunk2
+
+
+
+    chunk3
+.
+<pre><code>chunk1
+
+chunk2
+
+
+
+chunk3
+</code></pre>
+````````````````````````````````
+
+
+Any initial spaces beyond four will be included in the content, even
+in interior blank lines:
+
+```````````````````````````````` example
+    chunk1
+
+      chunk2
+.
+<pre><code>chunk1
+
+  chunk2
+</code></pre>
+````````````````````````````````
+
+
+An indented code block cannot interrupt a paragraph.  (This
+allows hanging indents and the like.)
+
+```````````````````````````````` example
+Foo
+    bar
+
+.
+<p>Foo
+bar</p>
+````````````````````````````````
+
+
+However, any non-blank line with fewer than four leading spaces ends
+the code block immediately.  So a paragraph may occur immediately
+after indented code:
+
+```````````````````````````````` example
+    foo
+bar
+.
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+````````````````````````````````
+
+
+And indented code can occur immediately before and after other kinds of
+blocks:
+
+```````````````````````````````` example
+# Heading
+    foo
+Heading
+------
+    foo
+----
+.
+<h1>Heading</h1>
+<pre><code>foo
+</code></pre>
+<h2>Heading</h2>
+<pre><code>foo
+</code></pre>
+<hr />
+````````````````````````````````
+
+
+The first line can be indented more than four spaces:
+
+```````````````````````````````` example
+        foo
+    bar
+.
+<pre><code>    foo
+bar
+</code></pre>
+````````````````````````````````
+
+
+Blank lines preceding or following an indented code block
+are not included in it:
+
+```````````````````````````````` example
+
+
+    foo
+
+
+.
+<pre><code>foo
+</code></pre>
+````````````````````````````````
+
+
+Trailing spaces are included in the code block's content:
+
+```````````````````````````````` example
+    foo
+.
+<pre><code>foo
+</code></pre>
+````````````````````````````````
+
+
+
+## Fenced code blocks
+
+A [code fence](@) is a sequence
+of at least three consecutive backtick characters (`` ` ``) or
+tildes (`~`).  (Tildes and backticks cannot be mixed.)
+A [fenced code block](@)
+begins with a code fence, indented no more than three spaces.
+
+The line with the opening code fence may optionally contain some text
+following the code fence; this is trimmed of leading and trailing
+whitespace and called the [info string](@). If the [info string] comes
+after a backtick fence, it may not contain any backtick
+characters.  (The reason for this restriction is that otherwise
+some inline code would be incorrectly interpreted as the
+beginning of a fenced code block.)
+
+The content of the code block consists of all subsequent lines, until
+a closing [code fence] of the same type as the code block
+began with (backticks or tildes), and with at least as many backticks
+or tildes as the opening code fence.  If the leading code fence is
+indented N spaces, then up to N spaces of indentation are removed from
+each line of the content (if present).  (If a content line is not
+indented, it is preserved unchanged.  If it is indented less than N
+spaces, all of the indentation is removed.)
+
+The closing code fence may be indented up to three spaces, and may be
+followed only by spaces, which are ignored.  If the end of the
+containing block (or document) is reached and no closing code fence
+has been found, the code block contains all of the lines after the
+opening code fence until the end of the containing block (or
+document).  (An alternative spec would require backtracking in the
+event that a closing code fence is not found.  But this makes parsing
+much less efficient, and there seems to be no real down side to the
+behavior described here.)
+
+A fenced code block may interrupt a paragraph, and does not require
+a blank line either before or after.
+
+The content of a code fence is treated as literal text, not parsed
+as inlines.  The first word of the [info string] is typically used to
+specify the language of the code sample, and rendered in the `class`
+attribute of the `code` tag.  However, this spec does not mandate any
+particular treatment of the [info string].
+
+Here is a simple example with backticks:
+
+```````````````````````````````` example
+```
+<
+ >
+```
+.
+<pre><code>&lt;
+ &gt;
+</code></pre>
+````````````````````````````````
+
+
+With tildes:
+
+```````````````````````````````` example
+~~~
+<
+ >
+~~~
+.
+<pre><code>&lt;
+ &gt;
+</code></pre>
+````````````````````````````````
+
+Fewer than three backticks is not enough:
+
+```````````````````````````````` example
+``
+foo
+``
+.
+<p><code>foo</code></p>
+````````````````````````````````
+
+The closing code fence must use the same character as the opening
+fence:
+
+```````````````````````````````` example
+```
+aaa
+~~~
+```
+.
+<pre><code>aaa
+~~~
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~
+aaa
+```
+~~~
+.
+<pre><code>aaa
+```
+</code></pre>
+````````````````````````````````
+
+
+The closing code fence must be at least as long as the opening fence:
+
+```````````````````````````````` example
+````
+aaa
+```
+``````
+.
+<pre><code>aaa
+```
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~~
+aaa
+~~~
+~~~~
+.
+<pre><code>aaa
+~~~
+</code></pre>
+````````````````````````````````
+
+
+Unclosed code blocks are closed by the end of the document
+(or the enclosing [block quote][block quotes] or [list item][list items]):
+
+```````````````````````````````` example
+```
+.
+<pre><code></code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+`````
+
+```
+aaa
+.
+<pre><code>
+```
+aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> ```
+> aaa
+
+bbb
+.
+<blockquote>
+<pre><code>aaa
+</code></pre>
+</blockquote>
+<p>bbb</p>
+````````````````````````````````
+
+
+A code block can have all empty lines as its content:
+
+```````````````````````````````` example
+```
+
+
+```
+.
+<pre><code>
+
+</code></pre>
+````````````````````````````````
+
+
+A code block can be empty:
+
+```````````````````````````````` example
+```
+```
+.
+<pre><code></code></pre>
+````````````````````````````````
+
+
+Fences can be indented.  If the opening fence is indented,
+content lines will have equivalent opening indentation removed,
+if present:
+
+```````````````````````````````` example
+ ```
+ aaa
+aaa
+```
+.
+<pre><code>aaa
+aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+  ```
+aaa
+  aaa
+aaa
+  ```
+.
+<pre><code>aaa
+aaa
+aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+   ```
+   aaa
+    aaa
+  aaa
+   ```
+.
+<pre><code>aaa
+ aaa
+aaa
+</code></pre>
+````````````````````````````````
+
+
+Four spaces indentation produces an indented code block:
+
+```````````````````````````````` example
+    ```
+    aaa
+    ```
+.
+<pre><code>```
+aaa
+```
+</code></pre>
+````````````````````````````````
+
+
+Closing fences may be indented by 0-3 spaces, and their indentation
+need not match that of the opening fence:
+
+```````````````````````````````` example
+```
+aaa
+  ```
+.
+<pre><code>aaa
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+   ```
+aaa
+  ```
+.
+<pre><code>aaa
+</code></pre>
+````````````````````````````````
+
+
+This is not a closing fence, because it is indented 4 spaces:
+
+```````````````````````````````` example
+```
+aaa
+    ```
+.
+<pre><code>aaa
+    ```
+</code></pre>
+````````````````````````````````
+
+
+
+Code fences (opening and closing) cannot contain internal spaces:
+
+```````````````````````````````` example
+``` ```
+aaa
+.
+<p><code> </code>
+aaa</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~~~~
+aaa
+~~~ ~~
+.
+<pre><code>aaa
+~~~ ~~
+</code></pre>
+````````````````````````````````
+
+
+Fenced code blocks can interrupt paragraphs, and can be followed
+directly by paragraphs, without a blank line between:
+
+```````````````````````````````` example
+foo
+```
+bar
+```
+baz
+.
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+````````````````````````````````
+
+
+Other blocks can also occur before and after fenced code blocks
+without an intervening blank line:
+
+```````````````````````````````` example
+foo
+---
+~~~
+bar
+~~~
+# baz
+.
+<h2>foo</h2>
+<pre><code>bar
+</code></pre>
+<h1>baz</h1>
+````````````````````````````````
+
+
+An [info string] can be provided after the opening code fence.
+Although this spec doesn't mandate any particular treatment of
+the info string, the first word is typically used to specify
+the language of the code block. In HTML output, the language is
+normally indicated by adding a class to the `code` element consisting
+of `language-` followed by the language name.
+
+```````````````````````````````` example
+```ruby
+def foo(x)
+  return 3
+end
+```
+.
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~~    ruby startline=3 $%@#$
+def foo(x)
+  return 3
+end
+~~~~~~~
+.
+<pre><code class="language-ruby">def foo(x)
+  return 3
+end
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+````;
+````
+.
+<pre><code class="language-;"></code></pre>
+````````````````````````````````
+
+
+[Info strings] for backtick code blocks cannot contain backticks:
+
+```````````````````````````````` example
+``` aa ```
+foo
+.
+<p><code>aa</code>
+foo</p>
+````````````````````````````````
+
+
+[Info strings] for tilde code blocks can contain backticks and tildes:
+
+```````````````````````````````` example
+~~~ aa ``` ~~~
+foo
+~~~
+.
+<pre><code class="language-aa">foo
+</code></pre>
+````````````````````````````````
+
+
+Closing code fences cannot have [info strings]:
+
+```````````````````````````````` example
+```
+``` aaa
+```
+.
+<pre><code>``` aaa
+</code></pre>
+````````````````````````````````
+
+
+
+## HTML blocks
+
+An [HTML block](@) is a group of lines that is treated
+as raw HTML (and will not be escaped in HTML output).
+
+There are seven kinds of [HTML block], which can be defined by their
+start and end conditions.  The block begins with a line that meets a
+[start condition](@) (after up to three spaces optional indentation).
+It ends with the first subsequent line that meets a matching [end
+condition](@), or the last line of the document, or the last line of
+the [container block](#container-blocks) containing the current HTML
+block, if no line is encountered that meets the [end condition].  If
+the first line meets both the [start condition] and the [end
+condition], the block will contain just that line.
+
+1.  **Start condition:**  line begins with the string `<script`,
+`<pre`, or `<style` (case-insensitive), followed by whitespace,
+the string `>`, or the end of the line.\
+**End condition:**  line contains an end tag
+`</script>`, `</pre>`, or `</style>` (case-insensitive; it
+need not match the start tag).
+
+2.  **Start condition:** line begins with the string `<!--`.\
+**End condition:**  line contains the string `-->`.
+
+3.  **Start condition:** line begins with the string `<?`.\
+**End condition:** line contains the string `?>`.
+
+4.  **Start condition:** line begins with the string `<!`
+followed by an uppercase ASCII letter.\
+**End condition:** line contains the character `>`.
+
+5.  **Start condition:**  line begins with the string
+`<![CDATA[`.\
+**End condition:** line contains the string `]]>`.
+
+6.  **Start condition:** line begins the string `<` or `</`
+followed by one of the strings (case-insensitive) `address`,
+`article`, `aside`, `base`, `basefont`, `blockquote`, `body`,
+`caption`, `center`, `col`, `colgroup`, `dd`, `details`, `dialog`,
+`dir`, `div`, `dl`, `dt`, `fieldset`, `figcaption`, `figure`,
+`footer`, `form`, `frame`, `frameset`,
+`h1`, `h2`, `h3`, `h4`, `h5`, `h6`, `head`, `header`, `hr`,
+`html`, `iframe`, `legend`, `li`, `link`, `main`, `menu`, `menuitem`,
+`nav`, `noframes`, `ol`, `optgroup`, `option`, `p`, `param`,
+`section`, `summary`, `table`, `tbody`, `td`,
+`tfoot`, `th`, `thead`, `title`, `tr`, `track`, `ul`, followed
+by [whitespace], the end of the line, the string `>`, or
+the string `/>`.\
+**End condition:** line is followed by a [blank line].
+
+7.  **Start condition:**  line begins with a complete [open tag]
+(with any [tag name] other than `script`,
+`style`, or `pre`) or a complete [closing tag],
+followed only by [whitespace] or the end of the line.\
+**End condition:** line is followed by a [blank line].
+
+HTML blocks continue until they are closed by their appropriate
+[end condition], or the last line of the document or other [container
+block](#container-blocks).  This means any HTML **within an HTML
+block** that might otherwise be recognised as a start condition will
+be ignored by the parser and passed through as-is, without changing
+the parser's state.
+
+For instance, `<pre>` within a HTML block started by `<table>` will not affect
+the parser state; as the HTML block was started in by start condition 6, it
+will end at any blank line. This can be surprising:
+
+```````````````````````````````` example
+<table><tr><td>
+<pre>
+**Hello**,
+
+_world_.
+</pre>
+</td></tr></table>
+.
+<table><tr><td>
+<pre>
+**Hello**,
+<p><em>world</em>.
+</pre></p>
+</td></tr></table>
+````````````````````````````````
+
+In this case, the HTML block is terminated by the newline — the `**Hello**`
+text remains verbatim — and regular parsing resumes, with a paragraph,
+emphasised `world` and inline and block HTML following.
+
+All types of [HTML blocks] except type 7 may interrupt
+a paragraph.  Blocks of type 7 may not interrupt a paragraph.
+(This restriction is intended to prevent unwanted interpretation
+of long tags inside a wrapped paragraph as starting HTML blocks.)
+
+Some simple examples follow.  Here are some basic HTML blocks
+of type 6:
+
+```````````````````````````````` example
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+
+okay.
+.
+<table>
+  <tr>
+    <td>
+           hi
+    </td>
+  </tr>
+</table>
+<p>okay.</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+ <div>
+  *hello*
+         <foo><a>
+.
+ <div>
+  *hello*
+         <foo><a>
+````````````````````````````````
+
+
+A block can also start with a closing tag:
+
+```````````````````````````````` example
+</div>
+*foo*
+.
+</div>
+*foo*
+````````````````````````````````
+
+
+Here we have two HTML blocks with a Markdown paragraph between them:
+
+```````````````````````````````` example
+<DIV CLASS="foo">
+
+*Markdown*
+
+</DIV>
+.
+<DIV CLASS="foo">
+<p><em>Markdown</em></p>
+</DIV>
+````````````````````````````````
+
+
+The tag on the first line can be partial, as long
+as it is split where there would be whitespace:
+
+```````````````````````````````` example
+<div id="foo"
+  class="bar">
+</div>
+.
+<div id="foo"
+  class="bar">
+</div>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<div id="foo" class="bar
+  baz">
+</div>
+.
+<div id="foo" class="bar
+  baz">
+</div>
+````````````````````````````````
+
+
+An open tag need not be closed:
+```````````````````````````````` example
+<div>
+*foo*
+
+*bar*
+.
+<div>
+*foo*
+<p><em>bar</em></p>
+````````````````````````````````
+
+
+
+A partial tag need not even be completed (garbage
+in, garbage out):
+
+```````````````````````````````` example
+<div id="foo"
+*hi*
+.
+<div id="foo"
+*hi*
+````````````````````````````````
+
+
+```````````````````````````````` example
+<div class
+foo
+.
+<div class
+foo
+````````````````````````````````
+
+
+The initial tag doesn't even need to be a valid
+tag, as long as it starts like one:
+
+```````````````````````````````` example
+<div *???-&&&-<---
+*foo*
+.
+<div *???-&&&-<---
+*foo*
+````````````````````````````````
+
+
+In type 6 blocks, the initial tag need not be on a line by
+itself:
+
+```````````````````````````````` example
+<div><a href="bar">*foo*</a></div>
+.
+<div><a href="bar">*foo*</a></div>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<table><tr><td>
+foo
+</td></tr></table>
+.
+<table><tr><td>
+foo
+</td></tr></table>
+````````````````````````````````
+
+
+Everything until the next blank line or end of document
+gets included in the HTML block.  So, in the following
+example, what looks like a Markdown code block
+is actually part of the HTML block, which continues until a blank
+line or the end of the document is reached:
+
+```````````````````````````````` example
+<div></div>
+``` c
+int x = 33;
+```
+.
+<div></div>
+``` c
+int x = 33;
+```
+````````````````````````````````
+
+
+To start an [HTML block] with a tag that is *not* in the
+list of block-level tags in (6), you must put the tag by
+itself on the first line (and it must be complete):
+
+```````````````````````````````` example
+<a href="foo">
+*bar*
+</a>
+.
+<a href="foo">
+*bar*
+</a>
+````````````````````````````````
+
+
+In type 7 blocks, the [tag name] can be anything:
+
+```````````````````````````````` example
+<Warning>
+*bar*
+</Warning>
+.
+<Warning>
+*bar*
+</Warning>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<i class="foo">
+*bar*
+</i>
+.
+<i class="foo">
+*bar*
+</i>
+````````````````````````````````
+
+
+```````````````````````````````` example
+</ins>
+*bar*
+.
+</ins>
+*bar*
+````````````````````````````````
+
+
+These rules are designed to allow us to work with tags that
+can function as either block-level or inline-level tags.
+The `<del>` tag is a nice example.  We can surround content with
+`<del>` tags in three different ways.  In this case, we get a raw
+HTML block, because the `<del>` tag is on a line by itself:
+
+```````````````````````````````` example
+<del>
+*foo*
+</del>
+.
+<del>
+*foo*
+</del>
+````````````````````````````````
+
+
+In this case, we get a raw HTML block that just includes
+the `<del>` tag (because it ends with the following blank
+line).  So the contents get interpreted as CommonMark:
+
+```````````````````````````````` example
+<del>
+
+*foo*
+
+</del>
+.
+<del>
+<p><em>foo</em></p>
+</del>
+````````````````````````````````
+
+
+Finally, in this case, the `<del>` tags are interpreted
+as [raw HTML] *inside* the CommonMark paragraph.  (Because
+the tag is not on a line by itself, we get inline HTML
+rather than an [HTML block].)
+
+```````````````````````````````` example
+<del>*foo*</del>
+.
+<p><del><em>foo</em></del></p>
+````````````````````````````````
+
+
+HTML tags designed to contain literal content
+(`script`, `style`, `pre`), comments, processing instructions,
+and declarations are treated somewhat differently.
+Instead of ending at the first blank line, these blocks
+end at the first line containing a corresponding end tag.
+As a result, these blocks can contain blank lines:
+
+A pre tag (type 1):
+
+```````````````````````````````` example
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+okay
+.
+<pre language="haskell"><code>
+import Text.HTML.TagSoup
+
+main :: IO ()
+main = print $ parseTags tags
+</code></pre>
+<p>okay</p>
+````````````````````````````````
+
+
+A script tag (type 1):
+
+```````````````````````````````` example
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+okay
+.
+<script type="text/javascript">
+// JavaScript example
+
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+<p>okay</p>
+````````````````````````````````
+
+
+A style tag (type 1):
+
+```````````````````````````````` example
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+okay
+.
+<style
+  type="text/css">
+h1 {color:red;}
+
+p {color:blue;}
+</style>
+<p>okay</p>
+````````````````````````````````
+
+
+If there is no matching end tag, the block will end at the
+end of the document (or the enclosing [block quote][block quotes]
+or [list item][list items]):
+
+```````````````````````````````` example
+<style
+  type="text/css">
+
+foo
+.
+<style
+  type="text/css">
+
+foo
+````````````````````````````````
+
+
+```````````````````````````````` example
+> <div>
+> foo
+
+bar
+.
+<blockquote>
+<div>
+foo
+</blockquote>
+<p>bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- <div>
+- foo
+.
+<ul>
+<li>
+<div>
+</li>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
+
+The end tag can occur on the same line as the start tag:
+
+```````````````````````````````` example
+<style>p{color:red;}</style>
+*foo*
+.
+<style>p{color:red;}</style>
+<p><em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<!-- foo -->*bar*
+*baz*
+.
+<!-- foo -->*bar*
+<p><em>baz</em></p>
+````````````````````````````````
+
+
+Note that anything on the last line after the
+end tag will be included in the [HTML block]:
+
+```````````````````````````````` example
+<script>
+foo
+</script>1. *bar*
+.
+<script>
+foo
+</script>1. *bar*
+````````````````````````````````
+
+
+A comment (type 2):
+
+```````````````````````````````` example
+<!-- Foo
+
+bar
+   baz -->
+okay
+.
+<!-- Foo
+
+bar
+   baz -->
+<p>okay</p>
+````````````````````````````````
+
+
+
+A processing instruction (type 3):
+
+```````````````````````````````` example
+<?php
+
+  echo '>';
+
+?>
+okay
+.
+<?php
+
+  echo '>';
+
+?>
+<p>okay</p>
+````````````````````````````````
+
+
+A declaration (type 4):
+
+```````````````````````````````` example
+<!DOCTYPE html>
+.
+<!DOCTYPE html>
+````````````````````````````````
+
+
+CDATA (type 5):
+
+```````````````````````````````` example
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+okay
+.
+<![CDATA[
+function matchwo(a,b)
+{
+  if (a < b && a < 0) then {
+    return 1;
+
+  } else {
+
+    return 0;
+  }
+}
+]]>
+<p>okay</p>
+````````````````````````````````
+
+
+The opening tag can be indented 1-3 spaces, but not 4:
+
+```````````````````````````````` example
+  <!-- foo -->
+
+    <!-- foo -->
+.
+  <!-- foo -->
+<pre><code>&lt;!-- foo --&gt;
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+  <div>
+
+    <div>
+.
+  <div>
+<pre><code>&lt;div&gt;
+</code></pre>
+````````````````````````````````
+
+
+An HTML block of types 1--6 can interrupt a paragraph, and need not be
+preceded by a blank line.
+
+```````````````````````````````` example
+Foo
+<div>
+bar
+</div>
+.
+<p>Foo</p>
+<div>
+bar
+</div>
+````````````````````````````````
+
+
+However, a following blank line is needed, except at the end of
+a document, and except for blocks of types 1--5, [above][HTML
+block]:
+
+```````````````````````````````` example
+<div>
+bar
+</div>
+*foo*
+.
+<div>
+bar
+</div>
+*foo*
+````````````````````````````````
+
+
+HTML blocks of type 7 cannot interrupt a paragraph:
+
+```````````````````````````````` example
+Foo
+<a href="bar">
+baz
+.
+<p>Foo
+<a href="bar">
+baz</p>
+````````````````````````````````
+
+
+This rule differs from John Gruber's original Markdown syntax
+specification, which says:
+
+> The only restrictions are that block-level HTML elements —
+> e.g. `<div>`, `<table>`, `<pre>`, `<p>`, etc. — must be separated from
+> surrounding content by blank lines, and the start and end tags of the
+> block should not be indented with tabs or spaces.
+
+In some ways Gruber's rule is more restrictive than the one given
+here:
+
+- It requires that an HTML block be preceded by a blank line.
+- It does not allow the start tag to be indented.
+- It requires a matching end tag, which it also does not allow to
+  be indented.
+
+Most Markdown implementations (including some of Gruber's own) do not
+respect all of these restrictions.
+
+There is one respect, however, in which Gruber's rule is more liberal
+than the one given here, since it allows blank lines to occur inside
+an HTML block.  There are two reasons for disallowing them here.
+First, it removes the need to parse balanced tags, which is
+expensive and can require backtracking from the end of the document
+if no matching end tag is found. Second, it provides a very simple
+and flexible way of including Markdown content inside HTML tags:
+simply separate the Markdown from the HTML using blank lines:
+
+Compare:
+
+```````````````````````````````` example
+<div>
+
+*Emphasized* text.
+
+</div>
+.
+<div>
+<p><em>Emphasized</em> text.</p>
+</div>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<div>
+*Emphasized* text.
+</div>
+.
+<div>
+*Emphasized* text.
+</div>
+````````````````````````````````
+
+
+Some Markdown implementations have adopted a convention of
+interpreting content inside tags as text if the open tag has
+the attribute `markdown=1`.  The rule given above seems a simpler and
+more elegant way of achieving the same expressive power, which is also
+much simpler to parse.
+
+The main potential drawback is that one can no longer paste HTML
+blocks into Markdown documents with 100% reliability.  However,
+*in most cases* this will work fine, because the blank lines in
+HTML are usually followed by HTML block tags.  For example:
+
+```````````````````````````````` example
+<table>
+
+<tr>
+
+<td>
+Hi
+</td>
+
+</tr>
+
+</table>
+.
+<table>
+<tr>
+<td>
+Hi
+</td>
+</tr>
+</table>
+````````````````````````````````
+
+
+There are problems, however, if the inner tags are indented
+*and* separated by spaces, as then they will be interpreted as
+an indented code block:
+
+```````````````````````````````` example
+<table>
+
+  <tr>
+
+    <td>
+      Hi
+    </td>
+
+  </tr>
+
+</table>
+.
+<table>
+  <tr>
+<pre><code>&lt;td&gt;
+  Hi
+&lt;/td&gt;
+</code></pre>
+  </tr>
+</table>
+````````````````````````````````
+
+
+Fortunately, blank lines are usually not necessary and can be
+deleted.  The exception is inside `<pre>` tags, but as described
+[above][HTML blocks], raw HTML blocks starting with `<pre>`
+*can* contain blank lines.
+
+## Link reference definitions
+
+A [link reference definition](@)
+consists of a [link label], indented up to three spaces, followed
+by a colon (`:`), optional [whitespace] (including up to one
+[line ending]), a [link destination],
+optional [whitespace] (including up to one
+[line ending]), and an optional [link
+title], which if it is present must be separated
+from the [link destination] by [whitespace].
+No further [non-whitespace characters] may occur on the line.
+
+A [link reference definition]
+does not correspond to a structural element of a document.  Instead, it
+defines a label which can be used in [reference links]
+and reference-style [images] elsewhere in the document.  [Link
+reference definitions] can come either before or after the links that use
+them.
+
+```````````````````````````````` example
+[foo]: /url "title"
+
+[foo]
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+   [foo]:
+      /url
+           'the title'
+
+[foo]
+.
+<p><a href="/url" title="the title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[Foo*bar\]]:my_(url) 'title (with parens)'
+
+[Foo*bar\]]
+.
+<p><a href="my_(url)" title="title (with parens)">Foo*bar]</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[Foo bar]:
+<my url>
+'title'
+
+[Foo bar]
+.
+<p><a href="my%20url" title="title">Foo bar</a></p>
+````````````````````````````````
+
+
+The title may extend over multiple lines:
+
+```````````````````````````````` example
+[foo]: /url '
+title
+line1
+line2
+'
+
+[foo]
+.
+<p><a href="/url" title="
+title
+line1
+line2
+">foo</a></p>
+````````````````````````````````
+
+
+However, it may not contain a [blank line]:
+
+```````````````````````````````` example
+[foo]: /url 'title
+
+with blank line'
+
+[foo]
+.
+<p>[foo]: /url 'title</p>
+<p>with blank line'</p>
+<p>[foo]</p>
+````````````````````````````````
+
+
+The title may be omitted:
+
+```````````````````````````````` example
+[foo]:
+/url
+
+[foo]
+.
+<p><a href="/url">foo</a></p>
+````````````````````````````````
+
+
+The link destination may not be omitted:
+
+```````````````````````````````` example
+[foo]:
+
+[foo]
+.
+<p>[foo]:</p>
+<p>[foo]</p>
+````````````````````````````````
+
+ However, an empty link destination may be specified using
+ angle brackets:
+
+```````````````````````````````` example
+[foo]: <>
+
+[foo]
+.
+<p><a href="">foo</a></p>
+````````````````````````````````
+
+The title must be separated from the link destination by
+whitespace:
+
+```````````````````````````````` example
+[foo]: <bar>(baz)
+
+[foo]
+.
+<p>[foo]: <bar>(baz)</p>
+<p>[foo]</p>
+````````````````````````````````
+
+
+Both title and destination can contain backslash escapes
+and literal backslashes:
+
+```````````````````````````````` example
+[foo]: /url\bar\*baz "foo\"bar\baz"
+
+[foo]
+.
+<p><a href="/url%5Cbar*baz" title="foo&quot;bar\baz">foo</a></p>
+````````````````````````````````
+
+
+A link can come before its corresponding definition:
+
+```````````````````````````````` example
+[foo]
+
+[foo]: url
+.
+<p><a href="url">foo</a></p>
+````````````````````````````````
+
+
+If there are several matching definitions, the first one takes
+precedence:
+
+```````````````````````````````` example
+[foo]
+
+[foo]: first
+[foo]: second
+.
+<p><a href="first">foo</a></p>
+````````````````````````````````
+
+
+As noted in the section on [Links], matching of labels is
+case-insensitive (see [matches]).
+
+```````````````````````````````` example
+[FOO]: /url
+
+[Foo]
+.
+<p><a href="/url">Foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[ΑΓΩ]: /φου
+
+[αγω]
+.
+<p><a href="/%CF%86%CE%BF%CF%85">αγω</a></p>
+````````````````````````````````
+
+
+Here is a link reference definition with no corresponding link.
+It contributes nothing to the document.
+
+```````````````````````````````` example
+[foo]: /url
+.
+````````````````````````````````
+
+
+Here is another one:
+
+```````````````````````````````` example
+[
+foo
+]: /url
+bar
+.
+<p>bar</p>
+````````````````````````````````
+
+
+This is not a link reference definition, because there are
+[non-whitespace characters] after the title:
+
+```````````````````````````````` example
+[foo]: /url "title" ok
+.
+<p>[foo]: /url &quot;title&quot; ok</p>
+````````````````````````````````
+
+
+This is a link reference definition, but it has no title:
+
+```````````````````````````````` example
+[foo]: /url
+"title" ok
+.
+<p>&quot;title&quot; ok</p>
+````````````````````````````````
+
+
+This is not a link reference definition, because it is indented
+four spaces:
+
+```````````````````````````````` example
+    [foo]: /url "title"
+
+[foo]
+.
+<pre><code>[foo]: /url &quot;title&quot;
+</code></pre>
+<p>[foo]</p>
+````````````````````````````````
+
+
+This is not a link reference definition, because it occurs inside
+a code block:
+
+```````````````````````````````` example
+```
+[foo]: /url
+```
+
+[foo]
+.
+<pre><code>[foo]: /url
+</code></pre>
+<p>[foo]</p>
+````````````````````````````````
+
+
+A [link reference definition] cannot interrupt a paragraph.
+
+```````````````````````````````` example
+Foo
+[bar]: /baz
+
+[bar]
+.
+<p>Foo
+[bar]: /baz</p>
+<p>[bar]</p>
+````````````````````````````````
+
+
+However, it can directly follow other block elements, such as headings
+and thematic breaks, and it need not be followed by a blank line.
+
+```````````````````````````````` example
+# [Foo]
+[foo]: /url
+> bar
+.
+<h1><a href="/url">Foo</a></h1>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo]: /url
+bar
+===
+[foo]
+.
+<h1>bar</h1>
+<p><a href="/url">foo</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo]: /url
+===
+[foo]
+.
+<p>===
+<a href="/url">foo</a></p>
+````````````````````````````````
+
+
+Several [link reference definitions]
+can occur one after another, without intervening blank lines.
+
+```````````````````````````````` example
+[foo]: /foo-url "foo"
+[bar]: /bar-url
+  "bar"
+[baz]: /baz-url
+
+[foo],
+[bar],
+[baz]
+.
+<p><a href="/foo-url" title="foo">foo</a>,
+<a href="/bar-url" title="bar">bar</a>,
+<a href="/baz-url">baz</a></p>
+````````````````````````````````
+
+
+[Link reference definitions] can occur
+inside block containers, like lists and block quotations.  They
+affect the entire document, not just the container in which they
+are defined:
+
+```````````````````````````````` example
+[foo]
+
+> [foo]: /url
+.
+<p><a href="/url">foo</a></p>
+<blockquote>
+</blockquote>
+````````````````````````````````
+
+
+Whether something is a [link reference definition] is
+independent of whether the link reference it defines is
+used in the document.  Thus, for example, the following
+document contains just a link reference definition, and
+no visible content:
+
+```````````````````````````````` example
+[foo]: /url
+.
+````````````````````````````````
+
+
+## Paragraphs
+
+A sequence of non-blank lines that cannot be interpreted as other
+kinds of blocks forms a [paragraph](@).
+The contents of the paragraph are the result of parsing the
+paragraph's raw content as inlines.  The paragraph's raw content
+is formed by concatenating the lines and removing initial and final
+[whitespace].
+
+A simple example with two paragraphs:
+
+```````````````````````````````` example
+aaa
+
+bbb
+.
+<p>aaa</p>
+<p>bbb</p>
+````````````````````````````````
+
+
+Paragraphs can contain multiple lines, but no blank lines:
+
+```````````````````````````````` example
+aaa
+bbb
+
+ccc
+ddd
+.
+<p>aaa
+bbb</p>
+<p>ccc
+ddd</p>
+````````````````````````````````
+
+
+Multiple blank lines between paragraph have no effect:
+
+```````````````````````````````` example
+aaa
+
+
+bbb
+.
+<p>aaa</p>
+<p>bbb</p>
+````````````````````````````````
+
+
+Leading spaces are skipped:
+
+```````````````````````````````` example
+  aaa
+ bbb
+.
+<p>aaa
+bbb</p>
+````````````````````````````````
+
+
+Lines after the first may be indented any amount, since indented
+code blocks cannot interrupt paragraphs.
+
+```````````````````````````````` example
+aaa
+             bbb
+                                       ccc
+.
+<p>aaa
+bbb
+ccc</p>
+````````````````````````````````
+
+
+However, the first line may be indented at most three spaces,
+or an indented code block will be triggered:
+
+```````````````````````````````` example
+   aaa
+bbb
+.
+<p>aaa
+bbb</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    aaa
+bbb
+.
+<pre><code>aaa
+</code></pre>
+<p>bbb</p>
+````````````````````````````````
+
+
+Final spaces are stripped before inline parsing, so a paragraph
+that ends with two or more spaces will not end with a [hard line
+break]:
+
+```````````````````````````````` example
+aaa
+bbb
+.
+<p>aaa<br />
+bbb</p>
+````````````````````````````````
+
+
+## Blank lines
+
+[Blank lines] between block-level elements are ignored,
+except for the role they play in determining whether a [list]
+is [tight] or [loose].
+
+Blank lines at the beginning and end of the document are also ignored.
+
+```````````````````````````````` example
+
+
+aaa
+
+
+# aaa
+
+
+.
+<p>aaa</p>
+<h1>aaa</h1>
+````````````````````````````````
+
+<div class="extension">
+
+## Tables (extension)
+
+GFM enables the `table` extension, where an additional leaf block type is
+available.
+
+A [table](@) is an arrangement of data with rows and columns, consisting of a
+single header row, a [delimiter row] separating the header from the data, and
+zero or more data rows.
+
+Each row consists of cells containing arbitrary text, in which [inlines] are
+parsed, separated by pipes (`|`).  A leading and trailing pipe is also
+recommended for clarity of reading, and if there's otherwise parsing ambiguity.
+Spaces between pipes and cell content are trimmed.  Block-level elements cannot
+be inserted in a table.
+
+The [delimiter row](@) consists of cells whose only content are hyphens (`-`),
+and optionally, a leading or trailing colon (`:`), or both, to indicate left,
+right, or center alignment respectively.
+
+```````````````````````````````` example table
+| foo | bar |
+| --- | --- |
+| baz | bim |
+.
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>bar</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>baz</td>
+<td>bim</td>
+</tr>
+</tbody>
+</table>
+````````````````````````````````
+
+Cells in one column don't need to match length, though it's easier to read if
+they are. Likewise, use of leading and trailing pipes may be inconsistent:
+
+```````````````````````````````` example table
+| abc | defghi |
+:-: | -----------:
+bar | baz
+.
+<table>
+<thead>
+<tr>
+<th align="center">abc</th>
+<th align="right">defghi</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td align="center">bar</td>
+<td align="right">baz</td>
+</tr>
+</tbody>
+</table>
+````````````````````````````````
+
+Include a pipe in a cell's content by escaping it, including inside other
+inline spans:
+
+```````````````````````````````` example table
+| f\|oo  |
+| ------ |
+| b `\|` az |
+| b **\|** im |
+.
+<table>
+<thead>
+<tr>
+<th>f|oo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>b <code>|</code> az</td>
+</tr>
+<tr>
+<td>b <strong>|</strong> im</td>
+</tr>
+</tbody>
+</table>
+````````````````````````````````
+
+The table is broken at the first empty line, or beginning of another
+block-level structure:
+
+```````````````````````````````` example table
+| abc | def |
+| --- | --- |
+| bar | baz |
+> bar
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+```````````````````````````````` example table
+| abc | def |
+| --- | --- |
+| bar | baz |
+bar
+
+bar
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+</tbody>
+</table>
+<p>bar</p>
+````````````````````````````````
+
+The header row must match the [delimiter row] in the number of cells.  If not,
+a table will not be recognized:
+
+```````````````````````````````` example table
+| abc | def |
+| --- |
+| bar |
+.
+<p>| abc | def |
+| --- |
+| bar |</p>
+````````````````````````````````
+
+The remainder of the table's rows may vary in the number of cells.  If there
+are a number of cells fewer than the number of cells in the header row, empty
+cells are inserted.  If there are greater, the excess is ignored:
+
+```````````````````````````````` example table
+| abc | def |
+| --- | --- |
+| bar |
+| bar | baz | boo |
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+````````````````````````````````
+
+If there are no rows in the body, no `<tbody>` is generated in HTML output:
+
+```````````````````````````````` example table
+| abc | def |
+| --- | --- |
+.
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+</table>
+````````````````````````````````
+
+</div>
+
+# Container blocks
+
+A [container block](#container-blocks) is a block that has other
+blocks as its contents.  There are two basic kinds of container blocks:
+[block quotes] and [list items].
+[Lists] are meta-containers for [list items].
+
+We define the syntax for container blocks recursively.  The general
+form of the definition is:
+
+> If X is a sequence of blocks, then the result of
+> transforming X in such-and-such a way is a container of type Y
+> with these blocks as its content.
+
+So, we explain what counts as a block quote or list item by explaining
+how these can be *generated* from their contents. This should suffice
+to define the syntax, although it does not give a recipe for *parsing*
+these constructions.  (A recipe is provided below in the section entitled
+[A parsing strategy](#appendix-a-parsing-strategy).)
+
+## Block quotes
+
+A [block quote marker](@)
+consists of 0-3 spaces of initial indent, plus (a) the character `>` together
+with a following space, or (b) a single character `>` not followed by a space.
+
+The following rules define [block quotes]:
+
+1.  **Basic case.**  If a string of lines *Ls* constitute a sequence
+    of blocks *Bs*, then the result of prepending a [block quote
+    marker] to the beginning of each line in *Ls*
+    is a [block quote](#block-quotes) containing *Bs*.
+
+2.  **Laziness.**  If a string of lines *Ls* constitute a [block
+    quote](#block-quotes) with contents *Bs*, then the result of deleting
+    the initial [block quote marker] from one or
+    more lines in which the next [non-whitespace character] after the [block
+    quote marker] is [paragraph continuation
+    text] is a block quote with *Bs* as its content.
+    [Paragraph continuation text](@) is text
+    that will be parsed as part of the content of a paragraph, but does
+    not occur at the beginning of the paragraph.
+
+3.  **Consecutiveness.**  A document cannot contain two [block
+    quotes] in a row unless there is a [blank line] between them.
+
+Nothing else counts as a [block quote](#block-quotes).
+
+Here is a simple example:
+
+```````````````````````````````` example
+> # Foo
+> bar
+> baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+The spaces after the `>` characters can be omitted:
+
+```````````````````````````````` example
+># Foo
+>bar
+> baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+The `>` characters can be indented 1-3 spaces:
+
+```````````````````````````````` example
+   > # Foo
+   > bar
+ > baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+Four spaces gives us a code block:
+
+```````````````````````````````` example
+    > # Foo
+    > bar
+    > baz
+.
+<pre><code>&gt; # Foo
+&gt; bar
+&gt; baz
+</code></pre>
+````````````````````````````````
+
+
+The Laziness clause allows us to omit the `>` before
+[paragraph continuation text]:
+
+```````````````````````````````` example
+> # Foo
+> bar
+baz
+.
+<blockquote>
+<h1>Foo</h1>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+A block quote can contain some lazy and some non-lazy
+continuation lines:
+
+```````````````````````````````` example
+> bar
+baz
+> foo
+.
+<blockquote>
+<p>bar
+baz
+foo</p>
+</blockquote>
+````````````````````````````````
+
+
+Laziness only applies to lines that would have been continuations of
+paragraphs had they been prepended with [block quote markers].
+For example, the `> ` cannot be omitted in the second line of
+
+``` markdown
+> foo
+> ---
+```
+
+without changing the meaning:
+
+```````````````````````````````` example
+> foo
+---
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<hr />
+````````````````````````````````
+
+
+Similarly, if we omit the `> ` in the second line of
+
+``` markdown
+> - foo
+> - bar
+```
+
+then the block quote ends after the first line:
+
+```````````````````````````````` example
+> - foo
+- bar
+.
+<blockquote>
+<ul>
+<li>foo</li>
+</ul>
+</blockquote>
+<ul>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+For the same reason, we can't omit the `> ` in front of
+subsequent lines of an indented or fenced code block:
+
+```````````````````````````````` example
+>     foo
+    bar
+.
+<blockquote>
+<pre><code>foo
+</code></pre>
+</blockquote>
+<pre><code>bar
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> ```
+foo
+```
+.
+<blockquote>
+<pre><code></code></pre>
+</blockquote>
+<p>foo</p>
+<pre><code></code></pre>
+````````````````````````````````
+
+
+Note that in the following case, we have a [lazy
+continuation line]:
+
+```````````````````````````````` example
+> foo
+    - bar
+.
+<blockquote>
+<p>foo
+- bar</p>
+</blockquote>
+````````````````````````````````
+
+
+To see why, note that in
+
+```markdown
+> foo
+>     - bar
+```
+
+the `- bar` is indented too far to start a list, and can't
+be an indented code block because indented code blocks cannot
+interrupt paragraphs, so it is [paragraph continuation text].
+
+A block quote can be empty:
+
+```````````````````````````````` example
+>
+.
+<blockquote>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+>
+>
+>
+.
+<blockquote>
+</blockquote>
+````````````````````````````````
+
+
+A block quote can have initial or final blank lines:
+
+```````````````````````````````` example
+>
+> foo
+>
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+````````````````````````````````
+
+
+A blank line always separates block quotes:
+
+```````````````````````````````` example
+> foo
+
+> bar
+.
+<blockquote>
+<p>foo</p>
+</blockquote>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+
+(Most current Markdown implementations, including John Gruber's
+original `Markdown.pl`, will parse this example as a single block quote
+with two paragraphs.  But it seems better to allow the author to decide
+whether two block quotes or one are wanted.)
+
+Consecutiveness means that if we put these block quotes together,
+we get a single block quote:
+
+```````````````````````````````` example
+> foo
+> bar
+.
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+````````````````````````````````
+
+
+To get a block quote with two paragraphs, use:
+
+```````````````````````````````` example
+> foo
+>
+> bar
+.
+<blockquote>
+<p>foo</p>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+
+Block quotes can interrupt paragraphs:
+
+```````````````````````````````` example
+foo
+> bar
+.
+<p>foo</p>
+<blockquote>
+<p>bar</p>
+</blockquote>
+````````````````````````````````
+
+
+In general, blank lines are not needed before or after block
+quotes:
+
+```````````````````````````````` example
+> aaa
+***
+> bbb
+.
+<blockquote>
+<p>aaa</p>
+</blockquote>
+<hr />
+<blockquote>
+<p>bbb</p>
+</blockquote>
+````````````````````````````````
+
+
+However, because of laziness, a blank line is needed between
+a block quote and a following paragraph:
+
+```````````````````````````````` example
+> bar
+baz
+.
+<blockquote>
+<p>bar
+baz</p>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> bar
+
+baz
+.
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> bar
+>
+baz
+.
+<blockquote>
+<p>bar</p>
+</blockquote>
+<p>baz</p>
+````````````````````````````````
+
+
+It is a consequence of the Laziness rule that any number
+of initial `>`s may be omitted on a continuation line of a
+nested block quote:
+
+```````````````````````````````` example
+> > > foo
+bar
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+>>> foo
+> bar
+>>baz
+.
+<blockquote>
+<blockquote>
+<blockquote>
+<p>foo
+bar
+baz</p>
+</blockquote>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+When including an indented code block in a block quote,
+remember that the [block quote marker] includes
+both the `>` and a following space.  So *five spaces* are needed after
+the `>`:
+
+```````````````````````````````` example
+>     code
+
+>    not code
+.
+<blockquote>
+<pre><code>code
+</code></pre>
+</blockquote>
+<blockquote>
+<p>not code</p>
+</blockquote>
+````````````````````````````````
+
+
+
+## List items
+
+A [list marker](@) is a
+[bullet list marker] or an [ordered list marker].
+
+A [bullet list marker](@)
+is a `-`, `+`, or `*` character.
+
+An [ordered list marker](@)
+is a sequence of 1--9 arabic digits (`0-9`), followed by either a
+`.` character or a `)` character.  (The reason for the length
+limit is that with 10 digits we start seeing integer overflows
+in some browsers.)
+
+The following rules define [list items]:
+
+1.  **Basic case.**  If a sequence of lines *Ls* constitute a sequence of
+    blocks *Bs* starting with a [non-whitespace character], and *M* is a
+    list marker of width *W* followed by 1 ≤ *N* ≤ 4 spaces, then the result
+    of prepending *M* and the following spaces to the first line of
+    *Ls*, and indenting subsequent lines of *Ls* by *W + N* spaces, is a
+    list item with *Bs* as its contents.  The type of the list item
+    (bullet or ordered) is determined by the type of its list marker.
+    If the list item is ordered, then it is also assigned a start
+    number, based on the ordered list marker.
+
+    Exceptions:
+
+    1. When the first list item in a [list] interrupts
+    a paragraph---that is, when it starts on a line that would
+    otherwise count as [paragraph continuation text]---then (a)
+    the lines *Ls* must not begin with a blank line, and (b) if
+    the list item is ordered, the start number must be 1.
+    2. If any line is a [thematic break][thematic breaks] then
+       that line is not a list item.
+
+For example, let *Ls* be the lines
+
+```````````````````````````````` example
+A paragraph
+with two lines.
+
+    indented code
+
+> A block quote.
+.
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+````````````````````````````````
+
+
+And let *M* be the marker `1.`, and *N* = 2.  Then rule #1 says
+that the following is an ordered list item with start number 1,
+and the same contents as *Ls*:
+
+```````````````````````````````` example
+1.  A paragraph
+    with two lines.
+
+        indented code
+
+    > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+The most important thing to notice is that the position of
+the text after the list marker determines how much indentation
+is needed in subsequent blocks in the list item.  If the list
+marker takes up two spaces, and there are three spaces between
+the list marker and the next [non-whitespace character], then blocks
+must be indented five spaces in order to fall under the list
+item.
+
+Here are some examples showing how far content must be indented to be
+put under the list item:
+
+```````````````````````````````` example
+- one
+
+ two
+.
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- one
+
+  two
+.
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+ -    one
+
+     two
+.
+<ul>
+<li>one</li>
+</ul>
+<pre><code> two
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+ -    one
+
+      two
+.
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+It is tempting to think of this in terms of columns:  the continuation
+blocks must be indented at least to the column of the first
+[non-whitespace character] after the list marker. However, that is not quite right.
+The spaces after the list marker determine how much relative indentation
+is needed.  Which column this indentation reaches will depend on
+how the list item is embedded in other constructions, as shown by
+this example:
+
+```````````````````````````````` example
+   > > 1.  one
+>>
+>>     two
+.
+<blockquote>
+<blockquote>
+<ol>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ol>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+Here `two` occurs in the same column as the list marker `1.`,
+but is actually contained in the list item, because there is
+sufficient indentation after the last containing blockquote marker.
+
+The converse is also possible.  In the following example, the word `two`
+occurs far to the right of the initial text of the list item, `one`, but
+it is not considered part of the list item, because it is not indented
+far enough past the blockquote marker:
+
+```````````````````````````````` example
+>>- one
+>>
+  >  > two
+.
+<blockquote>
+<blockquote>
+<ul>
+<li>one</li>
+</ul>
+<p>two</p>
+</blockquote>
+</blockquote>
+````````````````````````````````
+
+
+Note that at least one space is needed between the list marker and
+any following content, so these are not list items:
+
+```````````````````````````````` example
+-one
+
+2.two
+.
+<p>-one</p>
+<p>2.two</p>
+````````````````````````````````
+
+
+A list item may contain blocks that are separated by more than
+one blank line.
+
+```````````````````````````````` example
+- foo
+
+
+  bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+A list item may contain any kind of block:
+
+```````````````````````````````` example
+1.  foo
+
+    ```
+    bar
+    ```
+
+    baz
+
+    > bam
+.
+<ol>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+<p>baz</p>
+<blockquote>
+<p>bam</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+A list item that contains an indented code block will preserve
+empty lines within the code block verbatim.
+
+```````````````````````````````` example
+- Foo
+
+      bar
+
+
+      baz
+.
+<ul>
+<li>
+<p>Foo</p>
+<pre><code>bar
+
+
+baz
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+Note that ordered list start numbers must be nine digits or less:
+
+```````````````````````````````` example
+123456789. ok
+.
+<ol start="123456789">
+<li>ok</li>
+</ol>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1234567890. not ok
+.
+<p>1234567890. not ok</p>
+````````````````````````````````
+
+
+A start number may begin with 0s:
+
+```````````````````````````````` example
+0. ok
+.
+<ol start="0">
+<li>ok</li>
+</ol>
+````````````````````````````````
+
+
+```````````````````````````````` example
+003. ok
+.
+<ol start="3">
+<li>ok</li>
+</ol>
+````````````````````````````````
+
+
+A start number may not be negative:
+
+```````````````````````````````` example
+-1. not ok
+.
+<p>-1. not ok</p>
+````````````````````````````````
+
+
+
+2.  **Item starting with indented code.**  If a sequence of lines *Ls*
+    constitute a sequence of blocks *Bs* starting with an indented code
+    block, and *M* is a list marker of width *W* followed by
+    one space, then the result of prepending *M* and the following
+    space to the first line of *Ls*, and indenting subsequent lines of
+    *Ls* by *W + 1* spaces, is a list item with *Bs* as its contents.
+    If a line is empty, then it need not be indented.  The type of the
+    list item (bullet or ordered) is determined by the type of its list
+    marker.  If the list item is ordered, then it is also assigned a
+    start number, based on the ordered list marker.
+
+An indented code block will have to be indented four spaces beyond
+the edge of the region where text will be included in the list item.
+In the following case that is 6 spaces:
+
+```````````````````````````````` example
+- foo
+
+      bar
+.
+<ul>
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+
+And in this case it is 11 spaces:
+
+```````````````````````````````` example
+  10.  foo
+
+           bar
+.
+<ol start="10">
+<li>
+<p>foo</p>
+<pre><code>bar
+</code></pre>
+</li>
+</ol>
+````````````````````````````````
+
+
+If the *first* block in the list item is an indented code block,
+then by rule #2, the contents must be indented *one* space after the
+list marker:
+
+```````````````````````````````` example
+    indented code
+
+paragraph
+
+    more code
+.
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1.     indented code
+
+   paragraph
+
+       more code
+.
+<ol>
+<li>
+<pre><code>indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
+````````````````````````````````
+
+
+Note that an additional space indent is interpreted as space
+inside the code block:
+
+```````````````````````````````` example
+1.      indented code
+
+   paragraph
+
+       more code
+.
+<ol>
+<li>
+<pre><code> indented code
+</code></pre>
+<p>paragraph</p>
+<pre><code>more code
+</code></pre>
+</li>
+</ol>
+````````````````````````````````
+
+
+Note that rules #1 and #2 only apply to two cases:  (a) cases
+in which the lines to be included in a list item begin with a
+[non-whitespace character], and (b) cases in which
+they begin with an indented code
+block.  In a case like the following, where the first block begins with
+a three-space indent, the rules do not allow us to form a list item by
+indenting the whole thing and prepending a list marker:
+
+```````````````````````````````` example
+   foo
+
+bar
+.
+<p>foo</p>
+<p>bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+-    foo
+
+  bar
+.
+<ul>
+<li>foo</li>
+</ul>
+<p>bar</p>
+````````````````````````````````
+
+
+This is not a significant restriction, because when a block begins
+with 1-3 spaces indent, the indentation can always be removed without
+a change in interpretation, allowing rule #1 to be applied.  So, in
+the above case:
+
+```````````````````````````````` example
+-  foo
+
+   bar
+.
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+3.  **Item starting with a blank line.**  If a sequence of lines *Ls*
+    starting with a single [blank line] constitute a (possibly empty)
+    sequence of blocks *Bs*, not separated from each other by more than
+    one blank line, and *M* is a list marker of width *W*,
+    then the result of prepending *M* to the first line of *Ls*, and
+    indenting subsequent lines of *Ls* by *W + 1* spaces, is a list
+    item with *Bs* as its contents.
+    If a line is empty, then it need not be indented.  The type of the
+    list item (bullet or ordered) is determined by the type of its list
+    marker.  If the list item is ordered, then it is also assigned a
+    start number, based on the ordered list marker.
+
+Here are some list items that start with a blank line but are not empty:
+
+```````````````````````````````` example
+-
+  foo
+-
+  ```
+  bar
+  ```
+-
+      baz
+.
+<ul>
+<li>foo</li>
+<li>
+<pre><code>bar
+</code></pre>
+</li>
+<li>
+<pre><code>baz
+</code></pre>
+</li>
+</ul>
+````````````````````````````````
+
+When the list item starts with a blank line, the number of spaces
+following the list marker doesn't change the required indentation:
+
+```````````````````````````````` example
+-
+  foo
+.
+<ul>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
+
+A list item can begin with at most one blank line.
+In the following example, `foo` is not part of the list
+item:
+
+```````````````````````````````` example
+-
+
+  foo
+.
+<ul>
+<li></li>
+</ul>
+<p>foo</p>
+````````````````````````````````
+
+
+Here is an empty bullet list item:
+
+```````````````````````````````` example
+- foo
+-
+- bar
+.
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+It does not matter whether there are spaces following the [list marker]:
+
+```````````````````````````````` example
+- foo
+-
+- bar
+.
+<ul>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+Here is an empty ordered list item:
+
+```````````````````````````````` example
+1. foo
+2.
+3. bar
+.
+<ol>
+<li>foo</li>
+<li></li>
+<li>bar</li>
+</ol>
+````````````````````````````````
+
+
+A list may start or end with an empty list item:
+
+```````````````````````````````` example
+*
+.
+<ul>
+<li></li>
+</ul>
+````````````````````````````````
+
+However, an empty list item cannot interrupt a paragraph:
+
+```````````````````````````````` example
+foo
+*
+
+foo
+1.
+.
+<p>foo
+*</p>
+<p>foo
+1.</p>
+````````````````````````````````
+
+
+4.  **Indentation.**  If a sequence of lines *Ls* constitutes a list item
+    according to rule #1, #2, or #3, then the result of indenting each line
+    of *Ls* by 1-3 spaces (the same for each line) also constitutes a
+    list item with the same contents and attributes.  If a line is
+    empty, then it need not be indented.
+
+Indented one space:
+
+```````````````````````````````` example
+ 1.  A paragraph
+     with two lines.
+
+         indented code
+
+     > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Indented two spaces:
+
+```````````````````````````````` example
+  1.  A paragraph
+      with two lines.
+
+          indented code
+
+      > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Indented three spaces:
+
+```````````````````````````````` example
+   1.  A paragraph
+       with two lines.
+
+           indented code
+
+       > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Four spaces indent gives a code block:
+
+```````````````````````````````` example
+    1.  A paragraph
+        with two lines.
+
+            indented code
+
+        > A block quote.
+.
+<pre><code>1.  A paragraph
+    with two lines.
+
+        indented code
+
+    &gt; A block quote.
+</code></pre>
+````````````````````````````````
+
+
+
+5.  **Laziness.**  If a string of lines *Ls* constitute a [list
+    item](#list-items) with contents *Bs*, then the result of deleting
+    some or all of the indentation from one or more lines in which the
+    next [non-whitespace character] after the indentation is
+    [paragraph continuation text] is a
+    list item with the same contents and attributes.  The unindented
+    lines are called
+    [lazy continuation line](@)s.
+
+Here is an example with [lazy continuation lines]:
+
+```````````````````````````````` example
+  1.  A paragraph
+with two lines.
+
+          indented code
+
+      > A block quote.
+.
+<ol>
+<li>
+<p>A paragraph
+with two lines.</p>
+<pre><code>indented code
+</code></pre>
+<blockquote>
+<p>A block quote.</p>
+</blockquote>
+</li>
+</ol>
+````````````````````````````````
+
+
+Indentation can be partially deleted:
+
+```````````````````````````````` example
+  1.  A paragraph
+    with two lines.
+.
+<ol>
+<li>A paragraph
+with two lines.</li>
+</ol>
+````````````````````````````````
+
+
+These examples show how laziness can work in nested structures:
+
+```````````````````````````````` example
+> 1. > Blockquote
+continued here.
+.
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
+````````````````````````````````
+
+
+```````````````````````````````` example
+> 1. > Blockquote
+> continued here.
+.
+<blockquote>
+<ol>
+<li>
+<blockquote>
+<p>Blockquote
+continued here.</p>
+</blockquote>
+</li>
+</ol>
+</blockquote>
+````````````````````````````````
+
+
+
+6.  **That's all.** Nothing that is not counted as a list item by rules
+    #1--5 counts as a [list item](#list-items).
+
+The rules for sublists follow from the general rules
+[above][List items].  A sublist must be indented the same number
+of spaces a paragraph would need to be in order to be included
+in the list item.
+
+So, in this case we need two spaces indent:
+
+```````````````````````````````` example
+- foo
+  - bar
+    - baz
+      - boo
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>baz
+<ul>
+<li>boo</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+One is not enough:
+
+```````````````````````````````` example
+- foo
+ - bar
+  - baz
+   - boo
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+<li>baz</li>
+<li>boo</li>
+</ul>
+````````````````````````````````
+
+
+Here we need four, because the list marker is wider:
+
+```````````````````````````````` example
+10) foo
+    - bar
+.
+<ol start="10">
+<li>foo
+<ul>
+<li>bar</li>
+</ul>
+</li>
+</ol>
+````````````````````````````````
+
+
+Three is not enough:
+
+```````````````````````````````` example
+10) foo
+   - bar
+.
+<ol start="10">
+<li>foo</li>
+</ol>
+<ul>
+<li>bar</li>
+</ul>
+````````````````````````````````
+
+
+A list may be the first block in a list item:
+
+```````````````````````````````` example
+- - foo
+.
+<ul>
+<li>
+<ul>
+<li>foo</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1. - 2. foo
+.
+<ol>
+<li>
+<ul>
+<li>
+<ol start="2">
+<li>foo</li>
+</ol>
+</li>
+</ul>
+</li>
+</ol>
+````````````````````````````````
+
+
+A list item can contain a heading:
+
+```````````````````````````````` example
+- # Foo
+- Bar
+  ---
+  baz
+.
+<ul>
+<li>
+<h1>Foo</h1>
+</li>
+<li>
+<h2>Bar</h2>
+baz</li>
+</ul>
+````````````````````````````````
+
+
+### Motivation
+
+John Gruber's Markdown spec says the following about list items:
+
+1. "List markers typically start at the left margin, but may be indented
+   by up to three spaces. List markers must be followed by one or more
+   spaces or a tab."
+
+2. "To make lists look nice, you can wrap items with hanging indents....
+   But if you don't want to, you don't have to."
+
+3. "List items may consist of multiple paragraphs. Each subsequent
+   paragraph in a list item must be indented by either 4 spaces or one
+   tab."
+
+4. "It looks nice if you indent every line of the subsequent paragraphs,
+   but here again, Markdown will allow you to be lazy."
+
+5. "To put a blockquote within a list item, the blockquote's `>`
+   delimiters need to be indented."
+
+6. "To put a code block within a list item, the code block needs to be
+   indented twice — 8 spaces or two tabs."
+
+These rules specify that a paragraph under a list item must be indented
+four spaces (presumably, from the left margin, rather than the start of
+the list marker, but this is not said), and that code under a list item
+must be indented eight spaces instead of the usual four.  They also say
+that a block quote must be indented, but not by how much; however, the
+example given has four spaces indentation.  Although nothing is said
+about other kinds of block-level content, it is certainly reasonable to
+infer that *all* block elements under a list item, including other
+lists, must be indented four spaces.  This principle has been called the
+*four-space rule*.
+
+The four-space rule is clear and principled, and if the reference
+implementation `Markdown.pl` had followed it, it probably would have
+become the standard.  However, `Markdown.pl` allowed paragraphs and
+sublists to start with only two spaces indentation, at least on the
+outer level.  Worse, its behavior was inconsistent: a sublist of an
+outer-level list needed two spaces indentation, but a sublist of this
+sublist needed three spaces.  It is not surprising, then, that different
+implementations of Markdown have developed very different rules for
+determining what comes under a list item.  (Pandoc and python-Markdown,
+for example, stuck with Gruber's syntax description and the four-space
+rule, while discount, redcarpet, marked, PHP Markdown, and others
+followed `Markdown.pl`'s behavior more closely.)
+
+Unfortunately, given the divergences between implementations, there
+is no way to give a spec for list items that will be guaranteed not
+to break any existing documents.  However, the spec given here should
+correctly handle lists formatted with either the four-space rule or
+the more forgiving `Markdown.pl` behavior, provided they are laid out
+in a way that is natural for a human to read.
+
+The strategy here is to let the width and indentation of the list marker
+determine the indentation necessary for blocks to fall under the list
+item, rather than having a fixed and arbitrary number.  The writer can
+think of the body of the list item as a unit which gets indented to the
+right enough to fit the list marker (and any indentation on the list
+marker).  (The laziness rule, #5, then allows continuation lines to be
+unindented if needed.)
+
+This rule is superior, we claim, to any rule requiring a fixed level of
+indentation from the margin.  The four-space rule is clear but
+unnatural. It is quite unintuitive that
+
+``` markdown
+- foo
+
+  bar
+
+  - baz
+```
+
+should be parsed as two lists with an intervening paragraph,
+
+``` html
+<ul>
+<li>foo</li>
+</ul>
+<p>bar</p>
+<ul>
+<li>baz</li>
+</ul>
+```
+
+as the four-space rule demands, rather than a single list,
+
+``` html
+<ul>
+<li>
+<p>foo</p>
+<p>bar</p>
+<ul>
+<li>baz</li>
+</ul>
+</li>
+</ul>
+```
+
+The choice of four spaces is arbitrary.  It can be learned, but it is
+not likely to be guessed, and it trips up beginners regularly.
+
+Would it help to adopt a two-space rule?  The problem is that such
+a rule, together with the rule allowing 1--3 spaces indentation of the
+initial list marker, allows text that is indented *less than* the
+original list marker to be included in the list item. For example,
+`Markdown.pl` parses
+
+``` markdown
+   - one
+
+  two
+```
+
+as a single list item, with `two` a continuation paragraph:
+
+``` html
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+```
+
+and similarly
+
+``` markdown
+>   - one
+>
+>  two
+```
+
+as
+
+``` html
+<blockquote>
+<ul>
+<li>
+<p>one</p>
+<p>two</p>
+</li>
+</ul>
+</blockquote>
+```
+
+This is extremely unintuitive.
+
+Rather than requiring a fixed indent from the margin, we could require
+a fixed indent (say, two spaces, or even one space) from the list marker (which
+may itself be indented).  This proposal would remove the last anomaly
+discussed.  Unlike the spec presented above, it would count the following
+as a list item with a subparagraph, even though the paragraph `bar`
+is not indented as far as the first paragraph `foo`:
+
+``` markdown
+ 10. foo
+
+   bar
+```
+
+Arguably this text does read like a list item with `bar` as a subparagraph,
+which may count in favor of the proposal.  However, on this proposal indented
+code would have to be indented six spaces after the list marker.  And this
+would break a lot of existing Markdown, which has the pattern:
+
+``` markdown
+1.  foo
+
+        indented code
+```
+
+where the code is indented eight spaces.  The spec above, by contrast, will
+parse this text as expected, since the code block's indentation is measured
+from the beginning of `foo`.
+
+The one case that needs special treatment is a list item that *starts*
+with indented code.  How much indentation is required in that case, since
+we don't have a "first paragraph" to measure from?  Rule #2 simply stipulates
+that in such cases, we require one space indentation from the list marker
+(and then the normal four spaces for the indented code).  This will match the
+four-space rule in cases where the list marker plus its initial indentation
+takes four spaces (a common case), but diverge in other cases.
+
+<div class="extension">
+
+## Task list items (extension)
+
+GFM enables the `tasklist` extension, where an additional processing step is
+performed on [list items].
+
+A [task list item](@) is a [list item][list items] where the first block in it
+is a paragraph which begins with a [task list item marker] and at least one
+whitespace character before any other content.
+
+A [task list item marker](@) consists of an optional number of spaces, a left
+bracket (`[`), either a whitespace character or the letter `x` in either
+lowercase or uppercase, and then a right bracket (`]`).
+
+When rendered, the [task list item marker] is replaced with a semantic checkbox element;
+in an HTML output, this would be an `<input type="checkbox">` element.
+
+If the character between the brackets is a whitespace character, the checkbox
+is unchecked.  Otherwise, the checkbox is checked.
+
+This spec does not define how the checkbox elements are interacted with: in practice,
+implementors are free to render the checkboxes as disabled or inmutable elements,
+or they may dynamically handle dynamic interactions (i.e. checking, unchecking) in
+the final rendered document.
+
+```````````````````````````````` example disabled
+- [ ] foo
+- [x] bar
+.
+<ul>
+<li><input disabled="" type="checkbox"> foo</li>
+<li><input checked="" disabled="" type="checkbox"> bar</li>
+</ul>
+````````````````````````````````
+
+Task lists can be arbitrarily nested:
+
+```````````````````````````````` example disabled
+- [x] foo
+  - [ ] bar
+  - [x] baz
+- [ ] bim
+.
+<ul>
+<li><input checked="" disabled="" type="checkbox"> foo
+<ul>
+<li><input disabled="" type="checkbox"> bar</li>
+<li><input checked="" disabled="" type="checkbox"> baz</li>
+</ul>
+</li>
+<li><input disabled="" type="checkbox"> bim</li>
+</ul>
+````````````````````````````````
+
+</div>
+
+## Lists
+
+A [list](@) is a sequence of one or more
+list items [of the same type].  The list items
+may be separated by any number of blank lines.
+
+Two list items are [of the same type](@)
+if they begin with a [list marker] of the same type.
+Two list markers are of the
+same type if (a) they are bullet list markers using the same character
+(`-`, `+`, or `*`) or (b) they are ordered list numbers with the same
+delimiter (either `.` or `)`).
+
+A list is an [ordered list](@)
+if its constituent list items begin with
+[ordered list markers], and a
+[bullet list](@) if its constituent list
+items begin with [bullet list markers].
+
+The [start number](@)
+of an [ordered list] is determined by the list number of
+its initial list item.  The numbers of subsequent list items are
+disregarded.
+
+A list is [loose](@) if any of its constituent
+list items are separated by blank lines, or if any of its constituent
+list items directly contain two block-level elements with a blank line
+between them.  Otherwise a list is [tight](@).
+(The difference in HTML output is that paragraphs in a loose list are
+wrapped in `<p>` tags, while paragraphs in a tight list are not.)
+
+Changing the bullet or ordered list delimiter starts a new list:
+
+```````````````````````````````` example
+- foo
+- bar
++ baz
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<ul>
+<li>baz</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1. foo
+2. bar
+3) baz
+.
+<ol>
+<li>foo</li>
+<li>bar</li>
+</ol>
+<ol start="3">
+<li>baz</li>
+</ol>
+````````````````````````````````
+
+
+In CommonMark, a list can interrupt a paragraph. That is,
+no blank line is needed to separate a paragraph from a following
+list:
+
+```````````````````````````````` example
+Foo
+- bar
+- baz
+.
+<p>Foo</p>
+<ul>
+<li>bar</li>
+<li>baz</li>
+</ul>
+````````````````````````````````
+
+`Markdown.pl` does not allow this, through fear of triggering a list
+via a numeral in a hard-wrapped line:
+
+``` markdown
+The number of windows in my house is
+14.  The number of doors is 6.
+```
+
+Oddly, though, `Markdown.pl` *does* allow a blockquote to
+interrupt a paragraph, even though the same considerations might
+apply.
+
+In CommonMark, we do allow lists to interrupt paragraphs, for
+two reasons.  First, it is natural and not uncommon for people
+to start lists without blank lines:
+
+``` markdown
+I need to buy
+- new shoes
+- a coat
+- a plane ticket
+```
+
+Second, we are attracted to a
+
+> [principle of uniformity](@):
+> if a chunk of text has a certain
+> meaning, it will continue to have the same meaning when put into a
+> container block (such as a list item or blockquote).
+
+(Indeed, the spec for [list items] and [block quotes] presupposes
+this principle.) This principle implies that if
+
+``` markdown
+  * I need to buy
+    - new shoes
+    - a coat
+    - a plane ticket
+```
+
+is a list item containing a paragraph followed by a nested sublist,
+as all Markdown implementations agree it is (though the paragraph
+may be rendered without `<p>` tags, since the list is "tight"),
+then
+
+``` markdown
+I need to buy
+- new shoes
+- a coat
+- a plane ticket
+```
+
+by itself should be a paragraph followed by a nested sublist.
+
+Since it is well established Markdown practice to allow lists to
+interrupt paragraphs inside list items, the [principle of
+uniformity] requires us to allow this outside list items as
+well.  ([reStructuredText](http://docutils.sourceforge.net/rst.html)
+takes a different approach, requiring blank lines before lists
+even inside other list items.)
+
+In order to solve of unwanted lists in paragraphs with
+hard-wrapped numerals, we allow only lists starting with `1` to
+interrupt paragraphs.  Thus,
+
+```````````````````````````````` example
+The number of windows in my house is
+14.  The number of doors is 6.
+.
+<p>The number of windows in my house is
+14.  The number of doors is 6.</p>
+````````````````````````````````
+
+We may still get an unintended result in cases like
+
+```````````````````````````````` example
+The number of windows in my house is
+1.  The number of doors is 6.
+.
+<p>The number of windows in my house is</p>
+<ol>
+<li>The number of doors is 6.</li>
+</ol>
+````````````````````````````````
+
+but this rule should prevent most spurious list captures.
+
+There can be any number of blank lines between items:
+
+```````````````````````````````` example
+- foo
+
+- bar
+
+
+- baz
+.
+<ul>
+<li>
+<p>foo</p>
+</li>
+<li>
+<p>bar</p>
+</li>
+<li>
+<p>baz</p>
+</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+- foo
+  - bar
+    - baz
+
+
+      bim
+.
+<ul>
+<li>foo
+<ul>
+<li>bar
+<ul>
+<li>
+<p>baz</p>
+<p>bim</p>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+To separate consecutive lists of the same type, or to separate a
+list from an indented code block that would otherwise be parsed
+as a subparagraph of the final list item, you can insert a blank HTML
+comment:
+
+```````````````````````````````` example
+- foo
+- bar
+
+<!-- -->
+
+- baz
+- bim
+.
+<ul>
+<li>foo</li>
+<li>bar</li>
+</ul>
+<!-- -->
+<ul>
+<li>baz</li>
+<li>bim</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+-   foo
+
+    notcode
+
+-   foo
+
+<!-- -->
+
+    code
+.
+<ul>
+<li>
+<p>foo</p>
+<p>notcode</p>
+</li>
+<li>
+<p>foo</p>
+</li>
+</ul>
+<!-- -->
+<pre><code>code
+</code></pre>
+````````````````````````````````
+
+
+List items need not be indented to the same level.  The following
+list items will be treated as items at the same list level,
+since none is indented enough to belong to the previous list
+item:
+
+```````````````````````````````` example
+- a
+ - b
+  - c
+   - d
+  - e
+ - f
+- g
+.
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d</li>
+<li>e</li>
+<li>f</li>
+<li>g</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+1. a
+
+  2. b
+
+   3. c
+.
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ol>
+````````````````````````````````
+
+Note, however, that list items may not be indented more than
+three spaces.  Here `- e` is treated as a paragraph continuation
+line, because it is indented more than three spaces:
+
+```````````````````````````````` example
+- a
+ - b
+  - c
+   - d
+    - e
+.
+<ul>
+<li>a</li>
+<li>b</li>
+<li>c</li>
+<li>d
+- e</li>
+</ul>
+````````````````````````````````
+
+And here, `3. c` is treated as in indented code block,
+because it is indented four spaces and preceded by a
+blank line.
+
+```````````````````````````````` example
+1. a
+
+  2. b
+
+    3. c
+.
+<ol>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+</ol>
+<pre><code>3. c
+</code></pre>
+````````````````````````````````
+
+
+This is a loose list, because there is a blank line between
+two of the list items:
+
+```````````````````````````````` example
+- a
+- b
+
+- c
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>c</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+So is this, with a empty second item:
+
+```````````````````````````````` example
+* a
+*
+
+* c
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li></li>
+<li>
+<p>c</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+These are loose lists, even though there is no space between the items,
+because one of the items directly contains two block-level elements
+with a blank line between them:
+
+```````````````````````````````` example
+- a
+- b
+
+  c
+- d
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- a
+- b
+
+  [ref]: /url
+- d
+.
+<ul>
+<li>
+<p>a</p>
+</li>
+<li>
+<p>b</p>
+</li>
+<li>
+<p>d</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+This is a tight list, because the blank lines are in a code block:
+
+```````````````````````````````` example
+- a
+- ```
+  b
+
+
+  ```
+- c
+.
+<ul>
+<li>a</li>
+<li>
+<pre><code>b
+
+
+</code></pre>
+</li>
+<li>c</li>
+</ul>
+````````````````````````````````
+
+
+This is a tight list, because the blank line is between two
+paragraphs of a sublist.  So the sublist is loose while
+the outer list is tight:
+
+```````````````````````````````` example
+- a
+  - b
+
+    c
+- d
+.
+<ul>
+<li>a
+<ul>
+<li>
+<p>b</p>
+<p>c</p>
+</li>
+</ul>
+</li>
+<li>d</li>
+</ul>
+````````````````````````````````
+
+
+This is a tight list, because the blank line is inside the
+block quote:
+
+```````````````````````````````` example
+* a
+  > b
+  >
+* c
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+</li>
+<li>c</li>
+</ul>
+````````````````````````````````
+
+
+This list is tight, because the consecutive block elements
+are not separated by blank lines:
+
+```````````````````````````````` example
+- a
+  > b
+  ```
+  c
+  ```
+- d
+.
+<ul>
+<li>a
+<blockquote>
+<p>b</p>
+</blockquote>
+<pre><code>c
+</code></pre>
+</li>
+<li>d</li>
+</ul>
+````````````````````````````````
+
+
+A single-paragraph list is tight:
+
+```````````````````````````````` example
+- a
+.
+<ul>
+<li>a</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- a
+  - b
+.
+<ul>
+<li>a
+<ul>
+<li>b</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+This list is loose, because of the blank line between the
+two block elements in the list item:
+
+```````````````````````````````` example
+1. ```
+   foo
+   ```
+
+   bar
+.
+<ol>
+<li>
+<pre><code>foo
+</code></pre>
+<p>bar</p>
+</li>
+</ol>
+````````````````````````````````
+
+
+Here the outer list is loose, the inner list tight:
+
+```````````````````````````````` example
+* foo
+  * bar
+
+  baz
+.
+<ul>
+<li>
+<p>foo</p>
+<ul>
+<li>bar</li>
+</ul>
+<p>baz</p>
+</li>
+</ul>
+````````````````````````````````
+
+
+```````````````````````````````` example
+- a
+  - b
+  - c
+
+- d
+  - e
+  - f
+.
+<ul>
+<li>
+<p>a</p>
+<ul>
+<li>b</li>
+<li>c</li>
+</ul>
+</li>
+<li>
+<p>d</p>
+<ul>
+<li>e</li>
+<li>f</li>
+</ul>
+</li>
+</ul>
+````````````````````````````````
+
+
+# Inlines
+
+Inlines are parsed sequentially from the beginning of the character
+stream to the end (left to right, in left-to-right languages).
+Thus, for example, in
+
+```````````````````````````````` example
+`hi`lo`
+.
+<p><code>hi</code>lo`</p>
+````````````````````````````````
+
+`hi` is parsed as code, leaving the backtick at the end as a literal
+backtick.
+
+
+## Backslash escapes
+
+Any ASCII punctuation character may be backslash-escaped:
+
+```````````````````````````````` example
+\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\`\{\|\}\~
+.
+<p>!&quot;#$%&amp;'()*+,-./:;&lt;=&gt;?@[\]^_`{|}~</p>
+````````````````````````````````
+
+
+Backslashes before other characters are treated as literal
+backslashes:
+
+```````````````````````````````` example
+\	\A\a\ \3\φ\«
+.
+<p>\	\A\a\ \3\φ\«</p>
+````````````````````````````````
+
+
+Escaped characters are treated as regular characters and do
+not have their usual Markdown meanings:
+
+```````````````````````````````` example
+\*not emphasized*
+\<br/> not a tag
+\[not a link](/foo)
+\`not code`
+1\. not a list
+\* not a list
+\# not a heading
+\[foo]: /url "not a reference"
+\&ouml; not a character entity
+.
+<p>*not emphasized*
+&lt;br/&gt; not a tag
+[not a link](/foo)
+`not code`
+1. not a list
+* not a list
+# not a heading
+[foo]: /url &quot;not a reference&quot;
+&amp;ouml; not a character entity</p>
+````````````````````````````````
+
+
+If a backslash is itself escaped, the following character is not:
+
+```````````````````````````````` example
+\\*emphasis*
+.
+<p>\<em>emphasis</em></p>
+````````````````````````````````
+
+
+A backslash at the end of the line is a [hard line break]:
+
+```````````````````````````````` example
+foo\
+bar
+.
+<p>foo<br />
+bar</p>
+````````````````````````````````
+
+
+Backslash escapes do not work in code blocks, code spans, autolinks, or
+raw HTML:
+
+```````````````````````````````` example
+`` \[\` ``
+.
+<p><code>\[\`</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    \[\]
+.
+<pre><code>\[\]
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+~~~
+\[\]
+~~~
+.
+<pre><code>\[\]
+</code></pre>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<http://example.com?find=\*>
+.
+<p><a href="http://example.com?find=%5C*">http://example.com?find=\*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<a href="/bar\/)">
+.
+<a href="/bar\/)">
+````````````````````````````````
+
+
+But they work in all other contexts, including URLs and link titles,
+link references, and [info strings] in [fenced code blocks]:
+
+```````````````````````````````` example
+[foo](/bar\* "ti\*tle")
+.
+<p><a href="/bar*" title="ti*tle">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo]
+
+[foo]: /bar\* "ti\*tle"
+.
+<p><a href="/bar*" title="ti*tle">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+``` foo\+bar
+foo
+```
+.
+<pre><code class="language-foo+bar">foo
+</code></pre>
+````````````````````````````````
+
+
+
+## Entity and numeric character references
+
+Valid HTML entity references and numeric character references
+can be used in place of the corresponding Unicode character,
+with the following exceptions:
+
+- Entity and character references are not recognized in code
+  blocks and code spans.
+
+- Entity and character references cannot stand in place of
+  special characters that define structural elements in
+  CommonMark.  For example, although `&#42;` can be used
+  in place of a literal `*` character, `&#42;` cannot replace
+  `*` in emphasis delimiters, bullet list markers, or thematic
+  breaks.
+
+Conforming CommonMark parsers need not store information about
+whether a particular character was represented in the source
+using a Unicode character or an entity reference.
+
+[Entity references](@) consist of `&` + any of the valid
+HTML5 entity names + `;`. The
+document <https://html.spec.whatwg.org/multipage/entities.json>
+is used as an authoritative source for the valid entity
+references and their corresponding code points.
+
+```````````````````````````````` example
+&nbsp; &amp; &copy; &AElig; &Dcaron;
+&frac34; &HilbertSpace; &DifferentialD;
+&ClockwiseContourIntegral; &ngE;
+.
+<p>  &amp; © Æ Ď
+¾ ℋ ⅆ
+∲ ≧̸</p>
+````````````````````````````````
+
+
+[Decimal numeric character
+references](@)
+consist of `&#` + a string of 1--7 arabic digits + `;`. A
+numeric character reference is parsed as the corresponding
+Unicode character. Invalid Unicode code points will be replaced by
+the REPLACEMENT CHARACTER (`U+FFFD`).  For security reasons,
+the code point `U+0000` will also be replaced by `U+FFFD`.
+
+```````````````````````````````` example
+&#35; &#1234; &#992; &#0;
+.
+<p># Ӓ Ϡ �</p>
+````````````````````````````````
+
+
+[Hexadecimal numeric character
+references](@) consist of `&#` +
+either `X` or `x` + a string of 1-6 hexadecimal digits + `;`.
+They too are parsed as the corresponding Unicode character (this
+time specified with a hexadecimal numeral instead of decimal).
+
+```````````````````````````````` example
+&#X22; &#XD06; &#xcab;
+.
+<p>&quot; ആ ಫ</p>
+````````````````````````````````
+
+
+Here are some nonentities:
+
+```````````````````````````````` example
+&nbsp &x; &#; &#x;
+&#987654321;
+&#abcdef0;
+&ThisIsNotDefined; &hi?;
+.
+<p>&amp;nbsp &amp;x; &amp;#; &amp;#x;
+&amp;#987654321;
+&amp;#abcdef0;
+&amp;ThisIsNotDefined; &amp;hi?;</p>
+````````````````````````````````
+
+
+Although HTML5 does accept some entity references
+without a trailing semicolon (such as `&copy`), these are not
+recognized here, because it makes the grammar too ambiguous:
+
+```````````````````````````````` example
+&copy
+.
+<p>&amp;copy</p>
+````````````````````````````````
+
+
+Strings that are not on the list of HTML5 named entities are not
+recognized as entity references either:
+
+```````````````````````````````` example
+&MadeUpEntity;
+.
+<p>&amp;MadeUpEntity;</p>
+````````````````````````````````
+
+
+Entity and numeric character references are recognized in any
+context besides code spans or code blocks, including
+URLs, [link titles], and [fenced code block][] [info strings]:
+
+```````````````````````````````` example
+<a href="&ouml;&ouml;.html">
+.
+<a href="&ouml;&ouml;.html">
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo](/f&ouml;&ouml; "f&ouml;&ouml;")
+.
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo]
+
+[foo]: /f&ouml;&ouml; "f&ouml;&ouml;"
+.
+<p><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+``` f&ouml;&ouml;
+foo
+```
+.
+<pre><code class="language-föö">foo
+</code></pre>
+````````````````````````````````
+
+
+Entity and numeric character references are treated as literal
+text in code spans and code blocks:
+
+```````````````````````````````` example
+`f&ouml;&ouml;`
+.
+<p><code>f&amp;ouml;&amp;ouml;</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+    f&ouml;f&ouml;
+.
+<pre><code>f&amp;ouml;f&amp;ouml;
+</code></pre>
+````````````````````````````````
+
+
+Entity and numeric character references cannot be used
+in place of symbols indicating structure in CommonMark
+documents.
+
+```````````````````````````````` example
+&#42;foo&#42;
+*foo*
+.
+<p>*foo*
+<em>foo</em></p>
+````````````````````````````````
+
+```````````````````````````````` example
+&#42; foo
+
+* foo
+.
+<p>* foo</p>
+<ul>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
+```````````````````````````````` example
+foo&#10;&#10;bar
+.
+<p>foo
+
+bar</p>
+````````````````````````````````
+
+```````````````````````````````` example
+&#9;foo
+.
+<p>	foo</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[a](url &quot;tit&quot;)
+.
+<p>[a](url &quot;tit&quot;)</p>
+````````````````````````````````
+
+
+## Code spans
+
+A [backtick string](@)
+is a string of one or more backtick characters (`` ` ``) that is neither
+preceded nor followed by a backtick.
+
+A [code span](@) begins with a backtick string and ends with
+a backtick string of equal length.  The contents of the code span are
+the characters between the two backtick strings, normalized in the
+following ways:
+
+- First, [line endings] are converted to [spaces].
+- If the resulting string both begins *and* ends with a [space]
+  character, but does not consist entirely of [space]
+  characters, a single [space] character is removed from the
+  front and back.  This allows you to include code that begins
+  or ends with backtick characters, which must be separated by
+  whitespace from the opening or closing backtick strings.
+
+This is a simple code span:
+
+```````````````````````````````` example
+`foo`
+.
+<p><code>foo</code></p>
+````````````````````````````````
+
+
+Here two backticks are used, because the code contains a backtick.
+This example also illustrates stripping of a single leading and
+trailing space:
+
+```````````````````````````````` example
+`` foo ` bar ``
+.
+<p><code>foo ` bar</code></p>
+````````````````````````````````
+
+
+This example shows the motivation for stripping leading and trailing
+spaces:
+
+```````````````````````````````` example
+` `` `
+.
+<p><code>``</code></p>
+````````````````````````````````
+
+Note that only *one* space is stripped:
+
+```````````````````````````````` example
+`  ``  `
+.
+<p><code> `` </code></p>
+````````````````````````````````
+
+The stripping only happens if the space is on both
+sides of the string:
+
+```````````````````````````````` example
+` a`
+.
+<p><code> a</code></p>
+````````````````````````````````
+
+Only [spaces], and not [unicode whitespace] in general, are
+stripped in this way:
+
+```````````````````````````````` example
+` b `
+.
+<p><code> b </code></p>
+````````````````````````````````
+
+No stripping occurs if the code span contains only spaces:
+
+```````````````````````````````` example
+` `
+`  `
+.
+<p><code> </code>
+<code>  </code></p>
+````````````````````````````````
+
+
+[Line endings] are treated like spaces:
+
+```````````````````````````````` example
+``
+foo
+bar
+baz
+``
+.
+<p><code>foo bar   baz</code></p>
+````````````````````````````````
+
+```````````````````````````````` example
+``
+foo
+``
+.
+<p><code>foo </code></p>
+````````````````````````````````
+
+
+Interior spaces are not collapsed:
+
+```````````````````````````````` example
+`foo   bar
+baz`
+.
+<p><code>foo   bar  baz</code></p>
+````````````````````````````````
+
+Note that browsers will typically collapse consecutive spaces
+when rendering `<code>` elements, so it is recommended that
+the following CSS be used:
+
+    code{white-space: pre-wrap;}
+
+
+Note that backslash escapes do not work in code spans. All backslashes
+are treated literally:
+
+```````````````````````````````` example
+`foo\`bar`
+.
+<p><code>foo\</code>bar`</p>
+````````````````````````````````
+
+
+Backslash escapes are never needed, because one can always choose a
+string of *n* backtick characters as delimiters, where the code does
+not contain any strings of exactly *n* backtick characters.
+
+```````````````````````````````` example
+``foo`bar``
+.
+<p><code>foo`bar</code></p>
+````````````````````````````````
+
+```````````````````````````````` example
+` foo `` bar `
+.
+<p><code>foo `` bar</code></p>
+````````````````````````````````
+
+
+Code span backticks have higher precedence than any other inline
+constructs except HTML tags and autolinks.  Thus, for example, this is
+not parsed as emphasized text, since the second `*` is part of a code
+span:
+
+```````````````````````````````` example
+*foo`*`
+.
+<p>*foo<code>*</code></p>
+````````````````````````````````
+
+
+And this is not parsed as a link:
+
+```````````````````````````````` example
+[not a `link](/foo`)
+.
+<p>[not a <code>link](/foo</code>)</p>
+````````````````````````````````
+
+
+Code spans, HTML tags, and autolinks have the same precedence.
+Thus, this is code:
+
+```````````````````````````````` example
+`<a href="`">`
+.
+<p><code>&lt;a href=&quot;</code>&quot;&gt;`</p>
+````````````````````````````````
+
+
+But this is an HTML tag:
+
+```````````````````````````````` example
+<a href="`">`
+.
+<p><a href="`">`</p>
+````````````````````````````````
+
+
+And this is code:
+
+```````````````````````````````` example
+`<http://foo.bar.`baz>`
+.
+<p><code>&lt;http://foo.bar.</code>baz&gt;`</p>
+````````````````````````````````
+
+
+But this is an autolink:
+
+```````````````````````````````` example
+<http://foo.bar.`baz>`
+.
+<p><a href="http://foo.bar.%60baz">http://foo.bar.`baz</a>`</p>
+````````````````````````````````
+
+
+When a backtick string is not closed by a matching backtick string,
+we just have literal backticks:
+
+```````````````````````````````` example
+```foo``
+.
+<p>```foo``</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+`foo
+.
+<p>`foo</p>
+````````````````````````````````
+
+The following case also illustrates the need for opening and
+closing backtick strings to be equal in length:
+
+```````````````````````````````` example
+`foo``bar``
+.
+<p>`foo<code>bar</code></p>
+````````````````````````````````
+
+
+## Emphasis and strong emphasis
+
+John Gruber's original [Markdown syntax
+description](http://daringfireball.net/projects/markdown/syntax#em) says:
+
+> Markdown treats asterisks (`*`) and underscores (`_`) as indicators of
+> emphasis. Text wrapped with one `*` or `_` will be wrapped with an HTML
+> `<em>` tag; double `*`'s or `_`'s will be wrapped with an HTML `<strong>`
+> tag.
+
+This is enough for most users, but these rules leave much undecided,
+especially when it comes to nested emphasis.  The original
+`Markdown.pl` test suite makes it clear that triple `***` and
+`___` delimiters can be used for strong emphasis, and most
+implementations have also allowed the following patterns:
+
+``` markdown
+***strong emph***
+***strong** in emph*
+***emph* in strong**
+**in strong *emph***
+*in emph **strong***
+```
+
+The following patterns are less widely supported, but the intent
+is clear and they are useful (especially in contexts like bibliography
+entries):
+
+``` markdown
+*emph *with emph* in it*
+**strong **with strong** in it**
+```
+
+Many implementations have also restricted intraword emphasis to
+the `*` forms, to avoid unwanted emphasis in words containing
+internal underscores.  (It is best practice to put these in code
+spans, but users often do not.)
+
+``` markdown
+internal emphasis: foo*bar*baz
+no emphasis: foo_bar_baz
+```
+
+The rules given below capture all of these patterns, while allowing
+for efficient parsing strategies that do not backtrack.
+
+First, some definitions.  A [delimiter run](@) is either
+a sequence of one or more `*` characters that is not preceded or
+followed by a non-backslash-escaped `*` character, or a sequence
+of one or more `_` characters that is not preceded or followed by
+a non-backslash-escaped `_` character.
+
+A [left-flanking delimiter run](@) is
+a [delimiter run] that is (1) not followed by [Unicode whitespace],
+and either (2a) not followed by a [punctuation character], or
+(2b) followed by a [punctuation character] and
+preceded by [Unicode whitespace] or a [punctuation character].
+For purposes of this definition, the beginning and the end of
+the line count as Unicode whitespace.
+
+A [right-flanking delimiter run](@) is
+a [delimiter run] that is (1) not preceded by [Unicode whitespace],
+and either (2a) not preceded by a [punctuation character], or
+(2b) preceded by a [punctuation character] and
+followed by [Unicode whitespace] or a [punctuation character].
+For purposes of this definition, the beginning and the end of
+the line count as Unicode whitespace.
+
+Here are some examples of delimiter runs.
+
+  - left-flanking but not right-flanking:
+
+    ```
+    ***abc
+      _abc
+    **"abc"
+     _"abc"
+    ```
+
+  - right-flanking but not left-flanking:
+
+    ```
+     abc***
+     abc_
+    "abc"**
+    "abc"_
+    ```
+
+  - Both left and right-flanking:
+
+    ```
+     abc***def
+    "abc"_"def"
+    ```
+
+  - Neither left nor right-flanking:
+
+    ```
+    abc *** def
+    a _ b
+    ```
+
+(The idea of distinguishing left-flanking and right-flanking
+delimiter runs based on the character before and the character
+after comes from Roopesh Chander's
+[vfmd](http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-emphasis-tags).
+vfmd uses the terminology "emphasis indicator string" instead of "delimiter
+run," and its rules for distinguishing left- and right-flanking runs
+are a bit more complex than the ones given here.)
+
+The following rules define emphasis and strong emphasis:
+
+1.  A single `*` character [can open emphasis](@)
+    iff (if and only if) it is part of a [left-flanking delimiter run].
+
+2.  A single `_` character [can open emphasis] iff
+    it is part of a [left-flanking delimiter run]
+    and either (a) not part of a [right-flanking delimiter run]
+    or (b) part of a [right-flanking delimiter run]
+    preceded by punctuation.
+
+3.  A single `*` character [can close emphasis](@)
+    iff it is part of a [right-flanking delimiter run].
+
+4.  A single `_` character [can close emphasis] iff
+    it is part of a [right-flanking delimiter run]
+    and either (a) not part of a [left-flanking delimiter run]
+    or (b) part of a [left-flanking delimiter run]
+    followed by punctuation.
+
+5.  A double `**` [can open strong emphasis](@)
+    iff it is part of a [left-flanking delimiter run].
+
+6.  A double `__` [can open strong emphasis] iff
+    it is part of a [left-flanking delimiter run]
+    and either (a) not part of a [right-flanking delimiter run]
+    or (b) part of a [right-flanking delimiter run]
+    preceded by punctuation.
+
+7.  A double `**` [can close strong emphasis](@)
+    iff it is part of a [right-flanking delimiter run].
+
+8.  A double `__` [can close strong emphasis] iff
+    it is part of a [right-flanking delimiter run]
+    and either (a) not part of a [left-flanking delimiter run]
+    or (b) part of a [left-flanking delimiter run]
+    followed by punctuation.
+
+9.  Emphasis begins with a delimiter that [can open emphasis] and ends
+    with a delimiter that [can close emphasis], and that uses the same
+    character (`_` or `*`) as the opening delimiter.  The
+    opening and closing delimiters must belong to separate
+    [delimiter runs].  If one of the delimiters can both
+    open and close emphasis, then the sum of the lengths of the
+    delimiter runs containing the opening and closing delimiters
+    must not be a multiple of 3 unless both lengths are
+    multiples of 3.
+
+10. Strong emphasis begins with a delimiter that
+    [can open strong emphasis] and ends with a delimiter that
+    [can close strong emphasis], and that uses the same character
+    (`_` or `*`) as the opening delimiter.  The
+    opening and closing delimiters must belong to separate
+    [delimiter runs].  If one of the delimiters can both open
+    and close strong emphasis, then the sum of the lengths of
+    the delimiter runs containing the opening and closing
+    delimiters must not be a multiple of 3 unless both lengths
+    are multiples of 3.
+
+11. A literal `*` character cannot occur at the beginning or end of
+    `*`-delimited emphasis or `**`-delimited strong emphasis, unless it
+    is backslash-escaped.
+
+12. A literal `_` character cannot occur at the beginning or end of
+    `_`-delimited emphasis or `__`-delimited strong emphasis, unless it
+    is backslash-escaped.
+
+Where rules 1--12 above are compatible with multiple parsings,
+the following principles resolve ambiguity:
+
+13. The number of nestings should be minimized. Thus, for example,
+    an interpretation `<strong>...</strong>` is always preferred to
+    `<em><em>...</em></em>`.
+
+14. An interpretation `<em><strong>...</strong></em>` is always
+    preferred to `<strong><em>...</em></strong>`.
+
+15. When two potential emphasis or strong emphasis spans overlap,
+    so that the second begins before the first ends and ends after
+    the first ends, the first takes precedence. Thus, for example,
+    `*foo _bar* baz_` is parsed as `<em>foo _bar</em> baz_` rather
+    than `*foo <em>bar* baz</em>`.
+
+16. When there are two potential emphasis or strong emphasis spans
+    with the same closing delimiter, the shorter one (the one that
+    opens later) takes precedence. Thus, for example,
+    `**foo **bar baz**` is parsed as `**foo <strong>bar baz</strong>`
+    rather than `<strong>foo **bar baz</strong>`.
+
+17. Inline code spans, links, images, and HTML tags group more tightly
+    than emphasis.  So, when there is a choice between an interpretation
+    that contains one of these elements and one that does not, the
+    former always wins.  Thus, for example, `*[foo*](bar)` is
+    parsed as `*<a href="bar">foo*</a>` rather than as
+    `<em>[foo</em>](bar)`.
+
+These rules can be illustrated through a series of examples.
+
+Rule 1:
+
+```````````````````````````````` example
+*foo bar*
+.
+<p><em>foo bar</em></p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `*` is followed by
+whitespace, and hence not part of a [left-flanking delimiter run]:
+
+```````````````````````````````` example
+a * foo bar*
+.
+<p>a * foo bar*</p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `*` is preceded
+by an alphanumeric and followed by punctuation, and hence
+not part of a [left-flanking delimiter run]:
+
+```````````````````````````````` example
+a*"foo"*
+.
+<p>a*&quot;foo&quot;*</p>
+````````````````````````````````
+
+
+Unicode nonbreaking spaces count as whitespace, too:
+
+```````````````````````````````` example
+* a *
+.
+<p>* a *</p>
+````````````````````````````````
+
+
+Intraword emphasis with `*` is permitted:
+
+```````````````````````````````` example
+foo*bar*
+.
+<p>foo<em>bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+5*6*78
+.
+<p>5<em>6</em>78</p>
+````````````````````````````````
+
+
+Rule 2:
+
+```````````````````````````````` example
+_foo bar_
+.
+<p><em>foo bar</em></p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `_` is followed by
+whitespace:
+
+```````````````````````````````` example
+_ foo bar_
+.
+<p>_ foo bar_</p>
+````````````````````````````````
+
+
+This is not emphasis, because the opening `_` is preceded
+by an alphanumeric and followed by punctuation:
+
+```````````````````````````````` example
+a_"foo"_
+.
+<p>a_&quot;foo&quot;_</p>
+````````````````````````````````
+
+
+Emphasis with `_` is not allowed inside words:
+
+```````````````````````````````` example
+foo_bar_
+.
+<p>foo_bar_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+5_6_78
+.
+<p>5_6_78</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+пристаням_стремятся_
+.
+<p>пристаням_стремятся_</p>
+````````````````````````````````
+
+
+Here `_` does not generate emphasis, because the first delimiter run
+is right-flanking and the second left-flanking:
+
+```````````````````````````````` example
+aa_"bb"_cc
+.
+<p>aa_&quot;bb&quot;_cc</p>
+````````````````````````````````
+
+
+This is emphasis, even though the opening delimiter is
+both left- and right-flanking, because it is preceded by
+punctuation:
+
+```````````````````````````````` example
+foo-_(bar)_
+.
+<p>foo-<em>(bar)</em></p>
+````````````````````````````````
+
+
+Rule 3:
+
+This is not emphasis, because the closing delimiter does
+not match the opening delimiter:
+
+```````````````````````````````` example
+_foo*
+.
+<p>_foo*</p>
+````````````````````````````````
+
+
+This is not emphasis, because the closing `*` is preceded by
+whitespace:
+
+```````````````````````````````` example
+*foo bar *
+.
+<p>*foo bar *</p>
+````````````````````````````````
+
+
+A newline also counts as whitespace:
+
+```````````````````````````````` example
+*foo bar
+*
+.
+<p>*foo bar
+*</p>
+````````````````````````````````
+
+
+This is not emphasis, because the second `*` is
+preceded by punctuation and followed by an alphanumeric
+(hence it is not part of a [right-flanking delimiter run]:
+
+```````````````````````````````` example
+*(*foo)
+.
+<p>*(*foo)</p>
+````````````````````````````````
+
+
+The point of this restriction is more easily appreciated
+with this example:
+
+```````````````````````````````` example
+*(*foo*)*
+.
+<p><em>(<em>foo</em>)</em></p>
+````````````````````````````````
+
+
+Intraword emphasis with `*` is allowed:
+
+```````````````````````````````` example
+*foo*bar
+.
+<p><em>foo</em>bar</p>
+````````````````````````````````
+
+
+
+Rule 4:
+
+This is not emphasis, because the closing `_` is preceded by
+whitespace:
+
+```````````````````````````````` example
+_foo bar _
+.
+<p>_foo bar _</p>
+````````````````````````````````
+
+
+This is not emphasis, because the second `_` is
+preceded by punctuation and followed by an alphanumeric:
+
+```````````````````````````````` example
+_(_foo)
+.
+<p>_(_foo)</p>
+````````````````````````````````
+
+
+This is emphasis within emphasis:
+
+```````````````````````````````` example
+_(_foo_)_
+.
+<p><em>(<em>foo</em>)</em></p>
+````````````````````````````````
+
+
+Intraword emphasis is disallowed for `_`:
+
+```````````````````````````````` example
+_foo_bar
+.
+<p>_foo_bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_пристаням_стремятся
+.
+<p>_пристаням_стремятся</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo_bar_baz_
+.
+<p><em>foo_bar_baz</em></p>
+````````````````````````````````
+
+
+This is emphasis, even though the closing delimiter is
+both left- and right-flanking, because it is followed by
+punctuation:
+
+```````````````````````````````` example
+_(bar)_.
+.
+<p><em>(bar)</em>.</p>
+````````````````````````````````
+
+
+Rule 5:
+
+```````````````````````````````` example
+**foo bar**
+.
+<p><strong>foo bar</strong></p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening delimiter is
+followed by whitespace:
+
+```````````````````````````````` example
+** foo bar**
+.
+<p>** foo bar**</p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening `**` is preceded
+by an alphanumeric and followed by punctuation, and hence
+not part of a [left-flanking delimiter run]:
+
+```````````````````````````````` example
+a**"foo"**
+.
+<p>a**&quot;foo&quot;**</p>
+````````````````````````````````
+
+
+Intraword strong emphasis with `**` is permitted:
+
+```````````````````````````````` example
+foo**bar**
+.
+<p>foo<strong>bar</strong></p>
+````````````````````````````````
+
+
+Rule 6:
+
+```````````````````````````````` example
+__foo bar__
+.
+<p><strong>foo bar</strong></p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening delimiter is
+followed by whitespace:
+
+```````````````````````````````` example
+__ foo bar__
+.
+<p>__ foo bar__</p>
+````````````````````````````````
+
+
+A newline counts as whitespace:
+```````````````````````````````` example
+__
+foo bar__
+.
+<p>__
+foo bar__</p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the opening `__` is preceded
+by an alphanumeric and followed by punctuation:
+
+```````````````````````````````` example
+a__"foo"__
+.
+<p>a__&quot;foo&quot;__</p>
+````````````````````````````````
+
+
+Intraword strong emphasis is forbidden with `__`:
+
+```````````````````````````````` example
+foo__bar__
+.
+<p>foo__bar__</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+5__6__78
+.
+<p>5__6__78</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+пристаням__стремятся__
+.
+<p>пристаням__стремятся__</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo, __bar__, baz__
+.
+<p><strong>foo, <strong>bar</strong>, baz</strong></p>
+````````````````````````````````
+
+
+This is strong emphasis, even though the opening delimiter is
+both left- and right-flanking, because it is preceded by
+punctuation:
+
+```````````````````````````````` example
+foo-__(bar)__
+.
+<p>foo-<strong>(bar)</strong></p>
+````````````````````````````````
+
+
+
+Rule 7:
+
+This is not strong emphasis, because the closing delimiter is preceded
+by whitespace:
+
+```````````````````````````````` example
+**foo bar **
+.
+<p>**foo bar **</p>
+````````````````````````````````
+
+
+(Nor can it be interpreted as an emphasized `*foo bar *`, because of
+Rule 11.)
+
+This is not strong emphasis, because the second `**` is
+preceded by punctuation and followed by an alphanumeric:
+
+```````````````````````````````` example
+**(**foo)
+.
+<p>**(**foo)</p>
+````````````````````````````````
+
+
+The point of this restriction is more easily appreciated
+with these examples:
+
+```````````````````````````````` example
+*(**foo**)*
+.
+<p><em>(<strong>foo</strong>)</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**Gomphocarpus (*Gomphocarpus physocarpus*, syn.
+*Asclepias physocarpa*)**
+.
+<p><strong>Gomphocarpus (<em>Gomphocarpus physocarpus</em>, syn.
+<em>Asclepias physocarpa</em>)</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo "*bar*" foo**
+.
+<p><strong>foo &quot;<em>bar</em>&quot; foo</strong></p>
+````````````````````````````````
+
+
+Intraword emphasis:
+
+```````````````````````````````` example
+**foo**bar
+.
+<p><strong>foo</strong>bar</p>
+````````````````````````````````
+
+
+Rule 8:
+
+This is not strong emphasis, because the closing delimiter is
+preceded by whitespace:
+
+```````````````````````````````` example
+__foo bar __
+.
+<p>__foo bar __</p>
+````````````````````````````````
+
+
+This is not strong emphasis, because the second `__` is
+preceded by punctuation and followed by an alphanumeric:
+
+```````````````````````````````` example
+__(__foo)
+.
+<p>__(__foo)</p>
+````````````````````````````````
+
+
+The point of this restriction is more easily appreciated
+with this example:
+
+```````````````````````````````` example
+_(__foo__)_
+.
+<p><em>(<strong>foo</strong>)</em></p>
+````````````````````````````````
+
+
+Intraword strong emphasis is forbidden with `__`:
+
+```````````````````````````````` example
+__foo__bar
+.
+<p>__foo__bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__пристаням__стремятся
+.
+<p>__пристаням__стремятся</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo__bar__baz__
+.
+<p><strong>foo__bar__baz</strong></p>
+````````````````````````````````
+
+
+This is strong emphasis, even though the closing delimiter is
+both left- and right-flanking, because it is followed by
+punctuation:
+
+```````````````````````````````` example
+__(bar)__.
+.
+<p><strong>(bar)</strong>.</p>
+````````````````````````````````
+
+
+Rule 9:
+
+Any nonempty sequence of inline elements can be the contents of an
+emphasized span.
+
+```````````````````````````````` example
+*foo [bar](/url)*
+.
+<p><em>foo <a href="/url">bar</a></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo
+bar*
+.
+<p><em>foo
+bar</em></p>
+````````````````````````````````
+
+
+In particular, emphasis and strong emphasis can be nested
+inside emphasis:
+
+```````````````````````````````` example
+_foo __bar__ baz_
+.
+<p><em>foo <strong>bar</strong> baz</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo _bar_ baz_
+.
+<p><em>foo <em>bar</em> baz</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo_ bar_
+.
+<p><em><em>foo</em> bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo *bar**
+.
+<p><em>foo <em>bar</em></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo **bar** baz*
+.
+<p><em>foo <strong>bar</strong> baz</em></p>
+````````````````````````````````
+
+```````````````````````````````` example
+*foo**bar**baz*
+.
+<p><em>foo<strong>bar</strong>baz</em></p>
+````````````````````````````````
+
+Note that in the preceding case, the interpretation
+
+``` markdown
+<p><em>foo</em><em>bar<em></em>baz</em></p>
+```
+
+
+is precluded by the condition that a delimiter that
+can both open and close (like the `*` after `foo`)
+cannot form emphasis if the sum of the lengths of
+the delimiter runs containing the opening and
+closing delimiters is a multiple of 3 unless
+both lengths are multiples of 3.
+
+
+For the same reason, we don't get two consecutive
+emphasis sections in this example:
+
+```````````````````````````````` example
+*foo**bar*
+.
+<p><em>foo**bar</em></p>
+````````````````````````````````
+
+
+The same condition ensures that the following
+cases are all strong emphasis nested inside
+emphasis, even when the interior spaces are
+omitted:
+
+
+```````````````````````````````` example
+***foo** bar*
+.
+<p><em><strong>foo</strong> bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo **bar***
+.
+<p><em>foo <strong>bar</strong></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo**bar***
+.
+<p><em>foo<strong>bar</strong></em></p>
+````````````````````````````````
+
+
+When the lengths of the interior closing and opening
+delimiter runs are *both* multiples of 3, though,
+they can match to create emphasis:
+
+```````````````````````````````` example
+foo***bar***baz
+.
+<p>foo<em><strong>bar</strong></em>baz</p>
+````````````````````````````````
+
+```````````````````````````````` example
+foo******bar*********baz
+.
+<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>
+````````````````````````````````
+
+
+Indefinite levels of nesting are possible:
+
+```````````````````````````````` example
+*foo **bar *baz* bim** bop*
+.
+<p><em>foo <strong>bar <em>baz</em> bim</strong> bop</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo [*bar*](/url)*
+.
+<p><em>foo <a href="/url"><em>bar</em></a></em></p>
+````````````````````````````````
+
+
+There can be no empty emphasis or strong emphasis:
+
+```````````````````````````````` example
+** is not an empty emphasis
+.
+<p>** is not an empty emphasis</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**** is not an empty strong emphasis
+.
+<p>**** is not an empty strong emphasis</p>
+````````````````````````````````
+
+
+
+Rule 10:
+
+Any nonempty sequence of inline elements can be the contents of an
+strongly emphasized span.
+
+```````````````````````````````` example
+**foo [bar](/url)**
+.
+<p><strong>foo <a href="/url">bar</a></strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo
+bar**
+.
+<p><strong>foo
+bar</strong></p>
+````````````````````````````````
+
+
+In particular, emphasis and strong emphasis can be nested
+inside strong emphasis:
+
+```````````````````````````````` example
+__foo _bar_ baz__
+.
+<p><strong>foo <em>bar</em> baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo __bar__ baz__
+.
+<p><strong>foo <strong>bar</strong> baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____foo__ bar__
+.
+<p><strong><strong>foo</strong> bar</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo **bar****
+.
+<p><strong>foo <strong>bar</strong></strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo *bar* baz**
+.
+<p><strong>foo <em>bar</em> baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo*bar*baz**
+.
+<p><strong>foo<em>bar</em>baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+***foo* bar**
+.
+<p><strong><em>foo</em> bar</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo *bar***
+.
+<p><strong>foo <em>bar</em></strong></p>
+````````````````````````````````
+
+
+Indefinite levels of nesting are possible:
+
+```````````````````````````````` example
+**foo *bar **baz**
+bim* bop**
+.
+<p><strong>foo <em>bar <strong>baz</strong>
+bim</em> bop</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo [*bar*](/url)**
+.
+<p><strong>foo <a href="/url"><em>bar</em></a></strong></p>
+````````````````````````````````
+
+
+There can be no empty emphasis or strong emphasis:
+
+```````````````````````````````` example
+__ is not an empty emphasis
+.
+<p>__ is not an empty emphasis</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____ is not an empty strong emphasis
+.
+<p>____ is not an empty strong emphasis</p>
+````````````````````````````````
+
+
+
+Rule 11:
+
+```````````````````````````````` example
+foo ***
+.
+<p>foo ***</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo *\**
+.
+<p>foo <em>*</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo *_*
+.
+<p>foo <em>_</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo *****
+.
+<p>foo *****</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo **\***
+.
+<p>foo <strong>*</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo **_**
+.
+<p>foo <strong>_</strong></p>
+````````````````````````````````
+
+
+Note that when delimiters do not match evenly, Rule 11 determines
+that the excess literal `*` characters will appear outside of the
+emphasis, rather than inside it:
+
+```````````````````````````````` example
+**foo*
+.
+<p>*<em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo**
+.
+<p><em>foo</em>*</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+***foo**
+.
+<p>*<strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+****foo*
+.
+<p>***<em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**foo***
+.
+<p><strong>foo</strong>*</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo****
+.
+<p><em>foo</em>***</p>
+````````````````````````````````
+
+
+
+Rule 12:
+
+```````````````````````````````` example
+foo ___
+.
+<p>foo ___</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo _\__
+.
+<p>foo <em>_</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo _*_
+.
+<p>foo <em>*</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo _____
+.
+<p>foo _____</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo __\___
+.
+<p>foo <strong>_</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo __*__
+.
+<p>foo <strong>*</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo_
+.
+<p>_<em>foo</em></p>
+````````````````````````````````
+
+
+Note that when delimiters do not match evenly, Rule 12 determines
+that the excess literal `_` characters will appear outside of the
+emphasis, rather than inside it:
+
+```````````````````````````````` example
+_foo__
+.
+<p><em>foo</em>_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+___foo__
+.
+<p>_<strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____foo_
+.
+<p>___<em>foo</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo___
+.
+<p><strong>foo</strong>_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo____
+.
+<p><em>foo</em>___</p>
+````````````````````````````````
+
+
+Rule 13 implies that if you want emphasis nested directly inside
+emphasis, you must use different delimiters:
+
+```````````````````````````````` example
+**foo**
+.
+<p><strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*_foo_*
+.
+<p><em><em>foo</em></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__foo__
+.
+<p><strong>foo</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_*foo*_
+.
+<p><em><em>foo</em></em></p>
+````````````````````````````````
+
+
+However, strong emphasis within strong emphasis is possible without
+switching delimiters:
+
+```````````````````````````````` example
+****foo****
+.
+<p><strong><strong>foo</strong></strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+____foo____
+.
+<p><strong><strong>foo</strong></strong></p>
+````````````````````````````````
+
+
+
+Rule 13 can be applied to arbitrarily long sequences of
+delimiters:
+
+```````````````````````````````` example
+******foo******
+.
+<p><strong><strong><strong>foo</strong></strong></strong></p>
+````````````````````````````````
+
+
+Rule 14:
+
+```````````````````````````````` example
+***foo***
+.
+<p><em><strong>foo</strong></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_____foo_____
+.
+<p><em><strong><strong>foo</strong></strong></em></p>
+````````````````````````````````
+
+
+Rule 15:
+
+```````````````````````````````` example
+*foo _bar* baz_
+.
+<p><em>foo _bar</em> baz_</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo __bar *baz bim__ bam*
+.
+<p><em>foo <strong>bar *baz bim</strong> bam</em></p>
+````````````````````````````````
+
+
+Rule 16:
+
+```````````````````````````````` example
+**foo **bar baz**
+.
+<p>**foo <strong>bar baz</strong></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo *bar baz*
+.
+<p>*foo <em>bar baz</em></p>
+````````````````````````````````
+
+
+Rule 17:
+
+```````````````````````````````` example
+*[bar*](/url)
+.
+<p>*<a href="/url">bar*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_foo [bar_](/url)
+.
+<p>_foo <a href="/url">bar_</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*<img src="foo" title="*"/>
+.
+<p>*<img src="foo" title="*"/></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**<a href="**">
+.
+<p>**<a href="**"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__<a href="__">
+.
+<p>__<a href="__"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*a `*`*
+.
+<p><em>a <code>*</code></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+_a `_`_
+.
+<p><em>a <code>_</code></em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+**a<http://foo.bar/?q=**>
+.
+<p>**a<a href="http://foo.bar/?q=**">http://foo.bar/?q=**</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+__a<http://foo.bar/?q=__>
+.
+<p>__a<a href="http://foo.bar/?q=__">http://foo.bar/?q=__</a></p>
+````````````````````````````````
+
+
+<div class="extension">
+
+## Strikethrough (extension)
+
+GFM enables the `strikethrough` extension, where an additional emphasis type is
+available.
+
+Strikethrough text is any text wrapped in two tildes (`~`).
+
+```````````````````````````````` example strikethrough
+~~Hi~~ Hello, world!
+.
+<p><del>Hi</del> Hello, world!</p>
+````````````````````````````````
+
+As with regular emphasis delimiters, a new paragraph will cause strikethrough
+parsing to cease:
+
+```````````````````````````````` example strikethrough
+This ~~has a
+
+new paragraph~~.
+.
+<p>This ~~has a</p>
+<p>new paragraph~~.</p>
+````````````````````````````````
+
+Three or more tildes do not create a strikethrough:
+
+```````````````````````````````` example strikethrough
+This will ~~~not~~~ strike.
+.
+<p>This will ~~~not~~~ strike.</p>
+````````````````````````````````
+
+</div>
+
+## Links
+
+A link contains [link text] (the visible text), a [link destination]
+(the URI that is the link destination), and optionally a [link title].
+There are two basic kinds of links in Markdown.  In [inline links] the
+destination and title are given immediately after the link text.  In
+[reference links] the destination and title are defined elsewhere in
+the document.
+
+A [link text](@) consists of a sequence of zero or more
+inline elements enclosed by square brackets (`[` and `]`).  The
+following rules apply:
+
+- Links may not contain other links, at any level of nesting. If
+  multiple otherwise valid link definitions appear nested inside each
+  other, the inner-most definition is used.
+
+- Brackets are allowed in the [link text] only if (a) they
+  are backslash-escaped or (b) they appear as a matched pair of brackets,
+  with an open bracket `[`, a sequence of zero or more inlines, and
+  a close bracket `]`.
+
+- Backtick [code spans], [autolinks], and raw [HTML tags] bind more tightly
+  than the brackets in link text.  Thus, for example,
+  `` [foo`]` `` could not be a link text, since the second `]`
+  is part of a code span.
+
+- The brackets in link text bind more tightly than markers for
+  [emphasis and strong emphasis]. Thus, for example, `*[foo*](url)` is a link.
+
+A [link destination](@) consists of either
+
+- a sequence of zero or more characters between an opening `<` and a
+  closing `>` that contains no line breaks or unescaped
+  `<` or `>` characters, or
+
+- a nonempty sequence of characters that does not start with
+  `<`, does not include ASCII space or control characters, and
+  includes parentheses only if (a) they are backslash-escaped or
+  (b) they are part of a balanced pair of unescaped parentheses.
+  (Implementations may impose limits on parentheses nesting to
+  avoid performance issues, but at least three levels of nesting
+  should be supported.)
+
+A [link title](@)  consists of either
+
+- a sequence of zero or more characters between straight double-quote
+  characters (`"`), including a `"` character only if it is
+  backslash-escaped, or
+
+- a sequence of zero or more characters between straight single-quote
+  characters (`'`), including a `'` character only if it is
+  backslash-escaped, or
+
+- a sequence of zero or more characters between matching parentheses
+  (`(...)`), including a `(` or `)` character only if it is
+  backslash-escaped.
+
+Although [link titles] may span multiple lines, they may not contain
+a [blank line].
+
+An [inline link](@) consists of a [link text] followed immediately
+by a left parenthesis `(`, optional [whitespace], an optional
+[link destination], an optional [link title] separated from the link
+destination by [whitespace], optional [whitespace], and a right
+parenthesis `)`. The link's text consists of the inlines contained
+in the [link text] (excluding the enclosing square brackets).
+The link's URI consists of the link destination, excluding enclosing
+`<...>` if present, with backslash-escapes in effect as described
+above.  The link's title consists of the link title, excluding its
+enclosing delimiters, with backslash-escapes in effect as described
+above.
+
+Here is a simple inline link:
+
+```````````````````````````````` example
+[link](/uri "title")
+.
+<p><a href="/uri" title="title">link</a></p>
+````````````````````````````````
+
+
+The title may be omitted:
+
+```````````````````````````````` example
+[link](/uri)
+.
+<p><a href="/uri">link</a></p>
+````````````````````````````````
+
+
+Both the title and the destination may be omitted:
+
+```````````````````````````````` example
+[link]()
+.
+<p><a href="">link</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link](<>)
+.
+<p><a href="">link</a></p>
+````````````````````````````````
+
+The destination can only contain spaces if it is
+enclosed in pointy brackets:
+
+```````````````````````````````` example
+[link](/my uri)
+.
+<p>[link](/my uri)</p>
+````````````````````````````````
+
+```````````````````````````````` example
+[link](</my uri>)
+.
+<p><a href="/my%20uri">link</a></p>
+````````````````````````````````
+
+The destination cannot contain line breaks,
+even if enclosed in pointy brackets:
+
+```````````````````````````````` example
+[link](foo
+bar)
+.
+<p>[link](foo
+bar)</p>
+````````````````````````````````
+
+```````````````````````````````` example
+[link](<foo
+bar>)
+.
+<p>[link](<foo
+bar>)</p>
+````````````````````````````````
+
+The destination can contain `)` if it is enclosed
+in pointy brackets:
+
+```````````````````````````````` example
+[a](<b)c>)
+.
+<p><a href="b)c">a</a></p>
+````````````````````````````````
+
+Pointy brackets that enclose links must be unescaped:
+
+```````````````````````````````` example
+[link](<foo\>)
+.
+<p>[link](&lt;foo&gt;)</p>
+````````````````````````````````
+
+These are not links, because the opening pointy bracket
+is not matched properly:
+
+```````````````````````````````` example
+[a](<b)c
+[a](<b)c>
+[a](<b>c)
+.
+<p>[a](&lt;b)c
+[a](&lt;b)c&gt;
+[a](<b>c)</p>
+````````````````````````````````
+
+Parentheses inside the link destination may be escaped:
+
+```````````````````````````````` example
+[link](\(foo\))
+.
+<p><a href="(foo)">link</a></p>
+````````````````````````````````
+
+Any number of parentheses are allowed without escaping, as long as they are
+balanced:
+
+```````````````````````````````` example
+[link](foo(and(bar)))
+.
+<p><a href="foo(and(bar))">link</a></p>
+````````````````````````````````
+
+However, if you have unbalanced parentheses, you need to escape or use the
+`<...>` form:
+
+```````````````````````````````` example
+[link](foo\(and\(bar\))
+.
+<p><a href="foo(and(bar)">link</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link](<foo(and(bar)>)
+.
+<p><a href="foo(and(bar)">link</a></p>
+````````````````````````````````
+
+
+Parentheses and other symbols can also be escaped, as usual
+in Markdown:
+
+```````````````````````````````` example
+[link](foo\)\:)
+.
+<p><a href="foo):">link</a></p>
+````````````````````````````````
+
+
+A link can contain fragment identifiers and queries:
+
+```````````````````````````````` example
+[link](#fragment)
+
+[link](http://example.com#fragment)
+
+[link](http://example.com?foo=3#frag)
+.
+<p><a href="#fragment">link</a></p>
+<p><a href="http://example.com#fragment">link</a></p>
+<p><a href="http://example.com?foo=3#frag">link</a></p>
+````````````````````````````````
+
+
+Note that a backslash before a non-escapable character is
+just a backslash:
+
+```````````````````````````````` example
+[link](foo\bar)
+.
+<p><a href="foo%5Cbar">link</a></p>
+````````````````````````````````
+
+
+URL-escaping should be left alone inside the destination, as all
+URL-escaped characters are also valid URL characters. Entity and
+numerical character references in the destination will be parsed
+into the corresponding Unicode code points, as usual.  These may
+be optionally URL-escaped when written as HTML, but this spec
+does not enforce any particular policy for rendering URLs in
+HTML or other formats.  Renderers may make different decisions
+about how to escape or normalize URLs in the output.
+
+```````````````````````````````` example
+[link](foo%20b&auml;)
+.
+<p><a href="foo%20b%C3%A4">link</a></p>
+````````````````````````````````
+
+
+Note that, because titles can often be parsed as destinations,
+if you try to omit the destination and keep the title, you'll
+get unexpected results:
+
+```````````````````````````````` example
+[link]("title")
+.
+<p><a href="%22title%22">link</a></p>
+````````````````````````````````
+
+
+Titles may be in single quotes, double quotes, or parentheses:
+
+```````````````````````````````` example
+[link](/url "title")
+[link](/url 'title')
+[link](/url (title))
+.
+<p><a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a>
+<a href="/url" title="title">link</a></p>
+````````````````````````````````
+
+
+Backslash escapes and entity and numeric character references
+may be used in titles:
+
+```````````````````````````````` example
+[link](/url "title \"&quot;")
+.
+<p><a href="/url" title="title &quot;&quot;">link</a></p>
+````````````````````````````````
+
+
+Titles must be separated from the link using a [whitespace].
+Other [Unicode whitespace] like non-breaking space doesn't work.
+
+```````````````````````````````` example
+[link](/url "title")
+.
+<p><a href="/url%C2%A0%22title%22">link</a></p>
+````````````````````````````````
+
+
+Nested balanced quotes are not allowed without escaping:
+
+```````````````````````````````` example
+[link](/url "title "and" title")
+.
+<p>[link](/url &quot;title &quot;and&quot; title&quot;)</p>
+````````````````````````````````
+
+
+But it is easy to work around this by using a different quote type:
+
+```````````````````````````````` example
+[link](/url 'title "and" title')
+.
+<p><a href="/url" title="title &quot;and&quot; title">link</a></p>
+````````````````````````````````
+
+
+(Note:  `Markdown.pl` did allow double quotes inside a double-quoted
+title, and its test suite included a test demonstrating this.
+But it is hard to see a good rationale for the extra complexity this
+brings, since there are already many ways---backslash escaping,
+entity and numeric character references, or using a different
+quote type for the enclosing title---to write titles containing
+double quotes.  `Markdown.pl`'s handling of titles has a number
+of other strange features.  For example, it allows single-quoted
+titles in inline links, but not reference links.  And, in
+reference links but not inline links, it allows a title to begin
+with `"` and end with `)`.  `Markdown.pl` 1.0.1 even allows
+titles with no closing quotation mark, though 1.0.2b8 does not.
+It seems preferable to adopt a simple, rational rule that works
+the same way in inline links and link reference definitions.)
+
+[Whitespace] is allowed around the destination and title:
+
+```````````````````````````````` example
+[link](   /uri
+  "title"  )
+.
+<p><a href="/uri" title="title">link</a></p>
+````````````````````````````````
+
+
+But it is not allowed between the link text and the
+following parenthesis:
+
+```````````````````````````````` example
+[link] (/uri)
+.
+<p>[link] (/uri)</p>
+````````````````````````````````
+
+
+The link text may contain balanced brackets, but not unbalanced ones,
+unless they are escaped:
+
+```````````````````````````````` example
+[link [foo [bar]]](/uri)
+.
+<p><a href="/uri">link [foo [bar]]</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link] bar](/uri)
+.
+<p>[link] bar](/uri)</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link [bar](/uri)
+.
+<p>[link <a href="/uri">bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link \[bar](/uri)
+.
+<p><a href="/uri">link [bar</a></p>
+````````````````````````````````
+
+
+The link text may contain inline content:
+
+```````````````````````````````` example
+[link *foo **bar** `#`*](/uri)
+.
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[![moon](moon.jpg)](/uri)
+.
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
+````````````````````````````````
+
+
+However, links may not contain other links, at any level of nesting.
+
+```````````````````````````````` example
+[foo [bar](/uri)](/uri)
+.
+<p>[foo <a href="/uri">bar</a>](/uri)</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *[bar [baz](/uri)](/uri)*](/uri)
+.
+<p>[foo <em>[bar <a href="/uri">baz</a>](/uri)</em>](/uri)</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![[[foo](uri1)](uri2)](uri3)
+.
+<p><img src="uri3" alt="[foo](uri2)" /></p>
+````````````````````````````````
+
+
+These cases illustrate the precedence of link text grouping over
+emphasis grouping:
+
+```````````````````````````````` example
+*[foo*](/uri)
+.
+<p>*<a href="/uri">foo*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *bar](baz*)
+.
+<p><a href="baz*">foo *bar</a></p>
+````````````````````````````````
+
+
+Note that brackets that *aren't* part of links do not take
+precedence:
+
+```````````````````````````````` example
+*foo [bar* baz]
+.
+<p><em>foo [bar</em> baz]</p>
+````````````````````````````````
+
+
+These cases illustrate the precedence of HTML tags, code spans,
+and autolinks over link grouping:
+
+```````````````````````````````` example
+[foo <bar attr="](baz)">
+.
+<p>[foo <bar attr="](baz)"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo`](/uri)`
+.
+<p>[foo<code>](/uri)</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo<http://example.com/?search=](uri)>
+.
+<p>[foo<a href="http://example.com/?search=%5D(uri)">http://example.com/?search=](uri)</a></p>
+````````````````````````````````
+
+
+There are three kinds of [reference link](@)s:
+[full](#full-reference-link), [collapsed](#collapsed-reference-link),
+and [shortcut](#shortcut-reference-link).
+
+A [full reference link](@)
+consists of a [link text] immediately followed by a [link label]
+that [matches] a [link reference definition] elsewhere in the document.
+
+A [link label](@)  begins with a left bracket (`[`) and ends
+with the first right bracket (`]`) that is not backslash-escaped.
+Between these brackets there must be at least one [non-whitespace character].
+Unescaped square bracket characters are not allowed inside the
+opening and closing square brackets of [link labels].  A link
+label can have at most 999 characters inside the square
+brackets.
+
+One label [matches](@)
+another just in case their normalized forms are equal.  To normalize a
+label, strip off the opening and closing brackets,
+perform the *Unicode case fold*, strip leading and trailing
+[whitespace] and collapse consecutive internal
+[whitespace] to a single space.  If there are multiple
+matching reference link definitions, the one that comes first in the
+document is used.  (It is desirable in such cases to emit a warning.)
+
+The contents of the first link label are parsed as inlines, which are
+used as the link's text.  The link's URI and title are provided by the
+matching [link reference definition].
+
+Here is a simple example:
+
+```````````````````````````````` example
+[foo][bar]
+
+[bar]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+The rules for the [link text] are the same as with
+[inline links].  Thus:
+
+The link text may contain balanced brackets, but not unbalanced ones,
+unless they are escaped:
+
+```````````````````````````````` example
+[link [foo [bar]]][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link [foo [bar]]</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[link \[bar][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link [bar</a></p>
+````````````````````````````````
+
+
+The link text may contain inline content:
+
+```````````````````````````````` example
+[link *foo **bar** `#`*][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[![moon](moon.jpg)][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
+````````````````````````````````
+
+
+However, links may not contain other links, at any level of nesting.
+
+```````````````````````````````` example
+[foo [bar](/uri)][ref]
+
+[ref]: /uri
+.
+<p>[foo <a href="/uri">bar</a>]<a href="/uri">ref</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *bar [baz][ref]*][ref]
+
+[ref]: /uri
+.
+<p>[foo <em>bar <a href="/uri">baz</a></em>]<a href="/uri">ref</a></p>
+````````````````````````````````
+
+
+(In the examples above, we have two [shortcut reference links]
+instead of one [full reference link].)
+
+The following cases illustrate the precedence of link text grouping over
+emphasis grouping:
+
+```````````````````````````````` example
+*[foo*][ref]
+
+[ref]: /uri
+.
+<p>*<a href="/uri">foo*</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo *bar][ref]
+
+[ref]: /uri
+.
+<p><a href="/uri">foo *bar</a></p>
+````````````````````````````````
+
+
+These cases illustrate the precedence of HTML tags, code spans,
+and autolinks over link grouping:
+
+```````````````````````````````` example
+[foo <bar attr="][ref]">
+
+[ref]: /uri
+.
+<p>[foo <bar attr="][ref]"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo`][ref]`
+
+[ref]: /uri
+.
+<p>[foo<code>][ref]</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo<http://example.com/?search=][ref]>
+
+[ref]: /uri
+.
+<p>[foo<a href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
+````````````````````````````````
+
+
+Matching is case-insensitive:
+
+```````````````````````````````` example
+[foo][BaR]
+
+[bar]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+Unicode case fold is used:
+
+```````````````````````````````` example
+[Толпой][Толпой] is a Russian word.
+
+[ТОЛПОЙ]: /url
+.
+<p><a href="/url">Толпой</a> is a Russian word.</p>
+````````````````````````````````
+
+
+Consecutive internal [whitespace] is treated as one space for
+purposes of determining matching:
+
+```````````````````````````````` example
+[Foo
+  bar]: /url
+
+[Baz][Foo bar]
+.
+<p><a href="/url">Baz</a></p>
+````````````````````````````````
+
+
+No [whitespace] is allowed between the [link text] and the
+[link label]:
+
+```````````````````````````````` example
+[foo] [bar]
+
+[bar]: /url "title"
+.
+<p>[foo] <a href="/url" title="title">bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo]
+[bar]
+
+[bar]: /url "title"
+.
+<p>[foo]
+<a href="/url" title="title">bar</a></p>
+````````````````````````````````
+
+
+This is a departure from John Gruber's original Markdown syntax
+description, which explicitly allows whitespace between the link
+text and the link label.  It brings reference links in line with
+[inline links], which (according to both original Markdown and
+this spec) cannot have whitespace after the link text.  More
+importantly, it prevents inadvertent capture of consecutive
+[shortcut reference links]. If whitespace is allowed between the
+link text and the link label, then in the following we will have
+a single reference link, not two shortcut reference links, as
+intended:
+
+``` markdown
+[foo]
+[bar]
+
+[foo]: /url1
+[bar]: /url2
+```
+
+(Note that [shortcut reference links] were introduced by Gruber
+himself in a beta version of `Markdown.pl`, but never included
+in the official syntax description.  Without shortcut reference
+links, it is harmless to allow space between the link text and
+link label; but once shortcut references are introduced, it is
+too dangerous to allow this, as it frequently leads to
+unintended results.)
+
+When there are multiple matching [link reference definitions],
+the first is used:
+
+```````````````````````````````` example
+[foo]: /url1
+
+[foo]: /url2
+
+[bar][foo]
+.
+<p><a href="/url1">bar</a></p>
+````````````````````````````````
+
+
+Note that matching is performed on normalized strings, not parsed
+inline content.  So the following does not match, even though the
+labels define equivalent inline content:
+
+```````````````````````````````` example
+[bar][foo\!]
+
+[foo!]: /url
+.
+<p>[bar][foo!]</p>
+````````````````````````````````
+
+
+[Link labels] cannot contain brackets, unless they are
+backslash-escaped:
+
+```````````````````````````````` example
+[foo][ref[]
+
+[ref[]: /uri
+.
+<p>[foo][ref[]</p>
+<p>[ref[]: /uri</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo][ref[bar]]
+
+[ref[bar]]: /uri
+.
+<p>[foo][ref[bar]]</p>
+<p>[ref[bar]]: /uri</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[[[foo]]]
+
+[[[foo]]]: /url
+.
+<p>[[[foo]]]</p>
+<p>[[[foo]]]: /url</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[foo][ref\[]
+
+[ref\[]: /uri
+.
+<p><a href="/uri">foo</a></p>
+````````````````````````````````
+
+
+Note that in this example `]` is not backslash-escaped:
+
+```````````````````````````````` example
+[bar\\]: /uri
+
+[bar\\]
+.
+<p><a href="/uri">bar\</a></p>
+````````````````````````````````
+
+
+A [link label] must contain at least one [non-whitespace character]:
+
+```````````````````````````````` example
+[]
+
+[]: /uri
+.
+<p>[]</p>
+<p>[]: /uri</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[
+ ]
+
+[
+ ]: /uri
+.
+<p>[
+]</p>
+<p>[
+]: /uri</p>
+````````````````````````````````
+
+
+A [collapsed reference link](@)
+consists of a [link label] that [matches] a
+[link reference definition] elsewhere in the
+document, followed by the string `[]`.
+The contents of the first link label are parsed as inlines,
+which are used as the link's text.  The link's URI and title are
+provided by the matching reference link definition.  Thus,
+`[foo][]` is equivalent to `[foo][foo]`.
+
+```````````````````````````````` example
+[foo][]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[*foo* bar][]
+
+[*foo* bar]: /url "title"
+.
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
+````````````````````````````````
+
+
+The link labels are case-insensitive:
+
+```````````````````````````````` example
+[Foo][]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">Foo</a></p>
+````````````````````````````````
+
+
+
+As with full reference links, [whitespace] is not
+allowed between the two sets of brackets:
+
+```````````````````````````````` example
+[foo]
+[]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a>
+[]</p>
+````````````````````````````````
+
+
+A [shortcut reference link](@)
+consists of a [link label] that [matches] a
+[link reference definition] elsewhere in the
+document and is not followed by `[]` or a link label.
+The contents of the first link label are parsed as inlines,
+which are used as the link's text.  The link's URI and title
+are provided by the matching link reference definition.
+Thus, `[foo]` is equivalent to `[foo][]`.
+
+```````````````````````````````` example
+[foo]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[*foo* bar]
+
+[*foo* bar]: /url "title"
+.
+<p><a href="/url" title="title"><em>foo</em> bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[[*foo* bar]]
+
+[*foo* bar]: /url "title"
+.
+<p>[<a href="/url" title="title"><em>foo</em> bar</a>]</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+[[bar [foo]
+
+[foo]: /url
+.
+<p>[[bar <a href="/url">foo</a></p>
+````````````````````````````````
+
+
+The link labels are case-insensitive:
+
+```````````````````````````````` example
+[Foo]
+
+[foo]: /url "title"
+.
+<p><a href="/url" title="title">Foo</a></p>
+````````````````````````````````
+
+
+A space after the link text should be preserved:
+
+```````````````````````````````` example
+[foo] bar
+
+[foo]: /url
+.
+<p><a href="/url">foo</a> bar</p>
+````````````````````````````````
+
+
+If you just want bracketed text, you can backslash-escape the
+opening bracket to avoid links:
+
+```````````````````````````````` example
+\[foo]
+
+[foo]: /url "title"
+.
+<p>[foo]</p>
+````````````````````````````````
+
+
+Note that this is a link, because a link label ends with the first
+following closing bracket:
+
+```````````````````````````````` example
+[foo*]: /url
+
+*[foo*]
+.
+<p>*<a href="/url">foo*</a></p>
+````````````````````````````````
+
+
+Full and compact references take precedence over shortcut
+references:
+
+```````````````````````````````` example
+[foo][bar]
+
+[foo]: /url1
+[bar]: /url2
+.
+<p><a href="/url2">foo</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo][]
+
+[foo]: /url1
+.
+<p><a href="/url1">foo</a></p>
+````````````````````````````````
+
+Inline links also take precedence:
+
+```````````````````````````````` example
+[foo]()
+
+[foo]: /url1
+.
+<p><a href="">foo</a></p>
+````````````````````````````````
+
+```````````````````````````````` example
+[foo](not a link)
+
+[foo]: /url1
+.
+<p><a href="/url1">foo</a>(not a link)</p>
+````````````````````````````````
+
+In the following case `[bar][baz]` is parsed as a reference,
+`[foo]` as normal text:
+
+```````````````````````````````` example
+[foo][bar][baz]
+
+[baz]: /url
+.
+<p>[foo]<a href="/url">bar</a></p>
+````````````````````````````````
+
+
+Here, though, `[foo][bar]` is parsed as a reference, since
+`[bar]` is defined:
+
+```````````````````````````````` example
+[foo][bar][baz]
+
+[baz]: /url1
+[bar]: /url2
+.
+<p><a href="/url2">foo</a><a href="/url1">baz</a></p>
+````````````````````````````````
+
+
+Here `[foo]` is not parsed as a shortcut reference, because it
+is followed by a link label (even though `[bar]` is not defined):
+
+```````````````````````````````` example
+[foo][bar][baz]
+
+[baz]: /url1
+[foo]: /url2
+.
+<p>[foo]<a href="/url1">bar</a></p>
+````````````````````````````````
+
+
+
+## Images
+
+Syntax for images is like the syntax for links, with one
+difference. Instead of [link text], we have an
+[image description](@).  The rules for this are the
+same as for [link text], except that (a) an
+image description starts with `![` rather than `[`, and
+(b) an image description may contain links.
+An image description has inline elements
+as its contents.  When an image is rendered to HTML,
+this is standardly used as the image's `alt` attribute.
+
+```````````````````````````````` example
+![foo](/url "title")
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo *bar*]
+
+[foo *bar*]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo ![bar](/url)](/url2)
+.
+<p><img src="/url2" alt="foo bar" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo [bar](/url)](/url2)
+.
+<p><img src="/url2" alt="foo bar" /></p>
+````````````````````````````````
+
+
+Though this spec is concerned with parsing, not rendering, it is
+recommended that in rendering to HTML, only the plain string content
+of the [image description] be used.  Note that in
+the above example, the alt attribute's value is `foo bar`, not `foo
+[bar](/url)` or `foo <a href="/url">bar</a>`.  Only the plain string
+content is rendered, without formatting.
+
+```````````````````````````````` example
+![foo *bar*][]
+
+[foo *bar*]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo *bar*][foobar]
+
+[FOOBAR]: train.jpg "train & tracks"
+.
+<p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo](train.jpg)
+.
+<p><img src="train.jpg" alt="foo" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+My ![foo bar](/path/to/train.jpg  "title"   )
+.
+<p>My <img src="/path/to/train.jpg" alt="foo bar" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo](<url>)
+.
+<p><img src="url" alt="foo" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![](/url)
+.
+<p><img src="/url" alt="" /></p>
+````````````````````````````````
+
+
+Reference-style:
+
+```````````````````````````````` example
+![foo][bar]
+
+[bar]: /url
+.
+<p><img src="/url" alt="foo" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![foo][bar]
+
+[BAR]: /url
+.
+<p><img src="/url" alt="foo" /></p>
+````````````````````````````````
+
+
+Collapsed:
+
+```````````````````````````````` example
+![foo][]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![*foo* bar][]
+
+[*foo* bar]: /url "title"
+.
+<p><img src="/url" alt="foo bar" title="title" /></p>
+````````````````````````````````
+
+
+The labels are case-insensitive:
+
+```````````````````````````````` example
+![Foo][]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="Foo" title="title" /></p>
+````````````````````````````````
+
+
+As with reference links, [whitespace] is not allowed
+between the two sets of brackets:
+
+```````````````````````````````` example
+![foo]
+[]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" />
+[]</p>
+````````````````````````````````
+
+
+Shortcut:
+
+```````````````````````````````` example
+![foo]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="foo" title="title" /></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+![*foo* bar]
+
+[*foo* bar]: /url "title"
+.
+<p><img src="/url" alt="foo bar" title="title" /></p>
+````````````````````````````````
+
+
+Note that link labels cannot contain unescaped brackets:
+
+```````````````````````````````` example
+![[foo]]
+
+[[foo]]: /url "title"
+.
+<p>![[foo]]</p>
+<p>[[foo]]: /url &quot;title&quot;</p>
+````````````````````````````````
+
+
+The link labels are case-insensitive:
+
+```````````````````````````````` example
+![Foo]
+
+[foo]: /url "title"
+.
+<p><img src="/url" alt="Foo" title="title" /></p>
+````````````````````````````````
+
+
+If you just want a literal `!` followed by bracketed text, you can
+backslash-escape the opening `[`:
+
+```````````````````````````````` example
+!\[foo]
+
+[foo]: /url "title"
+.
+<p>![foo]</p>
+````````````````````````````````
+
+
+If you want a link after a literal `!`, backslash-escape the
+`!`:
+
+```````````````````````````````` example
+\![foo]
+
+[foo]: /url "title"
+.
+<p>!<a href="/url" title="title">foo</a></p>
+````````````````````````````````
+
+
+## Autolinks
+
+[Autolink](@)s are absolute URIs and email addresses inside
+`<` and `>`. They are parsed as links, with the URL or email address
+as the link label.
+
+A [URI autolink](@) consists of `<`, followed by an
+[absolute URI] followed by `>`.  It is parsed as
+a link to the URI, with the URI as the link's label.
+
+An [absolute URI](@),
+for these purposes, consists of a [scheme] followed by a colon (`:`)
+followed by zero or more characters other than ASCII
+[whitespace] and control characters, `<`, and `>`.  If
+the URI includes these characters, they must be percent-encoded
+(e.g. `%20` for a space).
+
+For purposes of this spec, a [scheme](@) is any sequence
+of 2--32 characters beginning with an ASCII letter and followed
+by any combination of ASCII letters, digits, or the symbols plus
+("+"), period ("."), or hyphen ("-").
+
+Here are some valid autolinks:
+
+```````````````````````````````` example
+<http://foo.bar.baz>
+.
+<p><a href="http://foo.bar.baz">http://foo.bar.baz</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<http://foo.bar.baz/test?q=hello&id=22&boolean>
+.
+<p><a href="http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean">http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<irc://foo.bar:2233/baz>
+.
+<p><a href="irc://foo.bar:2233/baz">irc://foo.bar:2233/baz</a></p>
+````````````````````````````````
+
+
+Uppercase is also fine:
+
+```````````````````````````````` example
+<MAILTO:FOO@BAR.BAZ>
+.
+<p><a href="MAILTO:FOO@BAR.BAZ">MAILTO:FOO@BAR.BAZ</a></p>
+````````````````````````````````
+
+
+Note that many strings that count as [absolute URIs] for
+purposes of this spec are not valid URIs, because their
+schemes are not registered or because of other problems
+with their syntax:
+
+```````````````````````````````` example
+<a+b+c:d>
+.
+<p><a href="a+b+c:d">a+b+c:d</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<made-up-scheme://foo,bar>
+.
+<p><a href="made-up-scheme://foo,bar">made-up-scheme://foo,bar</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<http://../>
+.
+<p><a href="http://../">http://../</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<localhost:5001/foo>
+.
+<p><a href="localhost:5001/foo">localhost:5001/foo</a></p>
+````````````````````````````````
+
+
+Spaces are not allowed in autolinks:
+
+```````````````````````````````` example
+<http://foo.bar/baz bim>
+.
+<p>&lt;http://foo.bar/baz bim&gt;</p>
+````````````````````````````````
+
+
+Backslash-escapes do not work inside autolinks:
+
+```````````````````````````````` example
+<http://example.com/\[\>
+.
+<p><a href="http://example.com/%5C%5B%5C">http://example.com/\[\</a></p>
+````````````````````````````````
+
+
+An [email autolink](@)
+consists of `<`, followed by an [email address],
+followed by `>`.  The link's label is the email address,
+and the URL is `mailto:` followed by the email address.
+
+An [email address](@),
+for these purposes, is anything that matches
+the [non-normative regex from the HTML5
+spec](https://html.spec.whatwg.org/multipage/forms.html#e-mail-state-(type=email)):
+
+    /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?
+    (?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/
+
+Examples of email autolinks:
+
+```````````````````````````````` example
+<foo@bar.example.com>
+.
+<p><a href="mailto:foo@bar.example.com">foo@bar.example.com</a></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<foo+special@Bar.baz-bar0.com>
+.
+<p><a href="mailto:foo+special@Bar.baz-bar0.com">foo+special@Bar.baz-bar0.com</a></p>
+````````````````````````````````
+
+
+Backslash-escapes do not work inside email autolinks:
+
+```````````````````````````````` example
+<foo\+@bar.example.com>
+.
+<p>&lt;foo+@bar.example.com&gt;</p>
+````````````````````````````````
+
+
+These are not autolinks:
+
+```````````````````````````````` example
+<>
+.
+<p>&lt;&gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+< http://foo.bar >
+.
+<p>&lt; http://foo.bar &gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<m:abc>
+.
+<p>&lt;m:abc&gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<foo.bar.baz>
+.
+<p>&lt;foo.bar.baz&gt;</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+http://example.com
+.
+<p>http://example.com</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo@bar.example.com
+.
+<p>foo@bar.example.com</p>
+````````````````````````````````
+
+<div class="extension">
+
+## Autolinks (extension)
+
+GFM enables the `autolink` extension, where autolinks will be recognised in a
+greater number of conditions.
+
+[Autolink]s can also be constructed without requiring the use of `<` and to `>`
+to delimit them, although they will be recognized under a smaller set of
+circumstances.  All such recognized autolinks can only come at the beginning of
+a line, after whitespace, or any of the delimiting characters `*`, `_`, `~`,
+and `(`.
+
+An [extended www autolink](@) will be recognized
+when the text `www.` is found followed by a [valid domain].
+A [valid domain](@) consists of segments
+of alphanumeric characters, underscores (`_`) and hyphens (`-`)
+separated by periods (`.`).
+There must be at least one period,
+and no underscores may be present in the last two segments of the domain.
+
+The scheme `http` will be inserted automatically:
+
+```````````````````````````````` example autolink
+www.commonmark.org
+.
+<p><a href="http://www.commonmark.org">www.commonmark.org</a></p>
+````````````````````````````````
+
+After a [valid domain], zero or more non-space non-`<` characters may follow:
+
+```````````````````````````````` example autolink
+Visit www.commonmark.org/help for more information.
+.
+<p>Visit <a href="http://www.commonmark.org/help">www.commonmark.org/help</a> for more information.</p>
+````````````````````````````````
+
+We then apply [extended autolink path validation](@) as follows:
+
+Trailing punctuation (specifically, `?`, `!`, `.`, `,`, `:`, `*`, `_`, and `~`)
+will not be considered part of the autolink, though they may be included in the
+interior of the link:
+
+```````````````````````````````` example autolink
+Visit www.commonmark.org.
+
+Visit www.commonmark.org/a.b.
+.
+<p>Visit <a href="http://www.commonmark.org">www.commonmark.org</a>.</p>
+<p>Visit <a href="http://www.commonmark.org/a.b">www.commonmark.org/a.b</a>.</p>
+````````````````````````````````
+
+When an autolink ends in `)`, we scan the entire autolink for the total number
+of parentheses.  If there is a greater number of closing parentheses than
+opening ones, we don't consider the unmatched trailing parentheses part of the
+autolink, in order to facilitate including an autolink inside a parenthesis:
+
+```````````````````````````````` example autolink
+www.google.com/search?q=Markup+(business)
+
+www.google.com/search?q=Markup+(business)))
+
+(www.google.com/search?q=Markup+(business))
+
+(www.google.com/search?q=Markup+(business)
+.
+<p><a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a></p>
+<p><a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a>))</p>
+<p>(<a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a>)</p>
+<p>(<a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a></p>
+````````````````````````````````
+
+This check is only done when the link ends in a closing parentheses `)`, so if
+the only parentheses are in the interior of the autolink, no special rules are
+applied:
+
+```````````````````````````````` example autolink
+www.google.com/search?q=(business))+ok
+.
+<p><a href="http://www.google.com/search?q=(business))+ok">www.google.com/search?q=(business))+ok</a></p>
+````````````````````````````````
+
+If an autolink ends in a semicolon (`;`), we check to see if it appears to
+resemble an [entity reference][entity references]; if the preceding text is `&`
+followed by one or more alphanumeric characters.  If so, it is excluded from
+the autolink:
+
+```````````````````````````````` example autolink
+www.google.com/search?q=commonmark&hl=en
+
+www.google.com/search?q=commonmark&hl;
+.
+<p><a href="http://www.google.com/search?q=commonmark&amp;hl=en">www.google.com/search?q=commonmark&amp;hl=en</a></p>
+<p><a href="http://www.google.com/search?q=commonmark">www.google.com/search?q=commonmark</a>&amp;hl;</p>
+````````````````````````````````
+
+`<` immediately ends an autolink.
+
+```````````````````````````````` example autolink
+www.commonmark.org/he<lp
+.
+<p><a href="http://www.commonmark.org/he">www.commonmark.org/he</a>&lt;lp</p>
+````````````````````````````````
+
+An [extended url autolink](@) will be recognised when one of the schemes
+`http://`, or `https://`, followed by a [valid domain], then zero or
+more non-space non-`<` characters according to
+[extended autolink path validation]:
+
+```````````````````````````````` example autolink
+http://commonmark.org
+
+(Visit https://encrypted.google.com/search?q=Markup+(business))
+.
+<p><a href="http://commonmark.org">http://commonmark.org</a></p>
+<p>(Visit <a href="https://encrypted.google.com/search?q=Markup+(business)">https://encrypted.google.com/search?q=Markup+(business)</a>)</p>
+````````````````````````````````
+
+An [extended email autolink](@) will be recognised when an email address is
+recognised within any text node.  Email addresses are recognised according to
+the following rules:
+
+* One ore more characters which are alphanumeric, or `.`, `-`, `_`, or `+`.
+* An `@` symbol.
+* One or more characters which are alphanumeric, or `-` or `_`,
+  separated by periods (`.`).
+  There must be at least one period.
+  The last character must not be one of `-` or `_`.
+
+The scheme `mailto:` will automatically be added to the generated link:
+
+```````````````````````````````` example autolink
+foo@bar.baz
+.
+<p><a href="mailto:foo@bar.baz">foo@bar.baz</a></p>
+````````````````````````````````
+
+`+` can occur before the `@`, but not after.
+
+```````````````````````````````` example autolink
+hello@mail+xyz.example isn't valid, but hello+xyz@mail.example is.
+.
+<p>hello@mail+xyz.example isn't valid, but <a href="mailto:hello+xyz@mail.example">hello+xyz@mail.example</a> is.</p>
+````````````````````````````````
+
+`.`, `-`, and `_` can occur on both sides of the `@`, but only `.` may occur at
+the end of the email address, in which case it will not be considered part of
+the address:
+
+```````````````````````````````` example autolink
+a.b-c_d@a.b
+
+a.b-c_d@a.b.
+
+a.b-c_d@a.b-
+
+a.b-c_d@a.b_
+.
+<p><a href="mailto:a.b-c_d@a.b">a.b-c_d@a.b</a></p>
+<p><a href="mailto:a.b-c_d@a.b">a.b-c_d@a.b</a>.</p>
+<p>a.b-c_d@a.b-</p>
+<p>a.b-c_d@a.b_</p>
+````````````````````````````````
+
+The scheme of the protocol will automatically be added to the generated link. All the rules of email address autolinking apply.
+
+```````````````````````````````` example autolink
+mailto:foo@bar.baz
+
+mailto:a.b-c_d@a.b
+
+mailto:a.b-c_d@a.b.
+
+mailto:a.b-c_d@a.b/
+
+mailto:a.b-c_d@a.b-
+
+mailto:a.b-c_d@a.b_
+
+xmpp:foo@bar.baz
+
+xmpp:foo@bar.baz.
+.
+<p><a href="mailto:foo@bar.baz">mailto:foo@bar.baz</a></p>
+<p><a href="mailto:a.b-c_d@a.b">mailto:a.b-c_d@a.b</a></p>
+<p><a href="mailto:a.b-c_d@a.b">mailto:a.b-c_d@a.b</a>.</p>
+<p><a href="mailto:a.b-c_d@a.b">mailto:a.b-c_d@a.b</a>/</p>
+<p>mailto:a.b-c_d@a.b-</p>
+<p>mailto:a.b-c_d@a.b_</p>
+<p><a href="xmpp:foo@bar.baz">xmpp:foo@bar.baz</a></p>
+<p><a href="xmpp:foo@bar.baz">xmpp:foo@bar.baz</a>.</p>
+````````````````````````````````
+
+A described in the specification xmpp offers an optional / followed by a resource. The resource can contain all alphanumeric characters, as well as @ and ..
+
+```````````````````````````````` example autolink
+xmpp:foo@bar.baz/txt
+
+xmpp:foo@bar.baz/txt@bin
+
+xmpp:foo@bar.baz/txt@bin.com
+.
+<p><a href="xmpp:foo@bar.baz/txt">xmpp:foo@bar.baz/txt</a></p>
+<p><a href="xmpp:foo@bar.baz/txt@bin">xmpp:foo@bar.baz/txt@bin</a></p>
+<p><a href="xmpp:foo@bar.baz/txt@bin.com">xmpp:foo@bar.baz/txt@bin.com</a></p>
+````````````````````````````````
+
+Further / characters are not considered part of the domain:
+
+```````````````````````````````` example autolink
+xmpp:foo@bar.baz/txt/bin
+.
+<p><a href="xmpp:foo@bar.baz/txt">xmpp:foo@bar.baz/txt</a>/bin</p>
+````````````````````````````````
+
+</div>
+
+## Raw HTML
+
+Text between `<` and `>` that looks like an HTML tag is parsed as a
+raw HTML tag and will be rendered in HTML without escaping.
+Tag and attribute names are not limited to current HTML tags,
+so custom tags (and even, say, DocBook tags) may be used.
+
+Here is the grammar for tags:
+
+A [tag name](@) consists of an ASCII letter
+followed by zero or more ASCII letters, digits, or
+hyphens (`-`).
+
+An [attribute](@) consists of [whitespace],
+an [attribute name], and an optional
+[attribute value specification].
+
+An [attribute name](@)
+consists of an ASCII letter, `_`, or `:`, followed by zero or more ASCII
+letters, digits, `_`, `.`, `:`, or `-`.  (Note:  This is the XML
+specification restricted to ASCII.  HTML5 is laxer.)
+
+An [attribute value specification](@)
+consists of optional [whitespace],
+a `=` character, optional [whitespace], and an [attribute
+value].
+
+An [attribute value](@)
+consists of an [unquoted attribute value],
+a [single-quoted attribute value], or a [double-quoted attribute value].
+
+An [unquoted attribute value](@)
+is a nonempty string of characters not
+including [whitespace], `"`, `'`, `=`, `<`, `>`, or `` ` ``.
+
+A [single-quoted attribute value](@)
+consists of `'`, zero or more
+characters not including `'`, and a final `'`.
+
+A [double-quoted attribute value](@)
+consists of `"`, zero or more
+characters not including `"`, and a final `"`.
+
+An [open tag](@) consists of a `<` character, a [tag name],
+zero or more [attributes], optional [whitespace], an optional `/`
+character, and a `>` character.
+
+A [closing tag](@) consists of the string `</`, a
+[tag name], optional [whitespace], and the character `>`.
+
+An [HTML comment](@) consists of `<!--` + *text* + `-->`,
+where *text* does not start with `>` or `->`, does not end with `-`,
+and does not contain `--`.  (See the
+[HTML5 spec](http://www.w3.org/TR/html5/syntax.html#comments).)
+
+A [processing instruction](@)
+consists of the string `<?`, a string
+of characters not including the string `?>`, and the string
+`?>`.
+
+A [declaration](@) consists of the
+string `<!`, a name consisting of one or more uppercase ASCII letters,
+[whitespace], a string of characters not including the
+character `>`, and the character `>`.
+
+A [CDATA section](@) consists of
+the string `<![CDATA[`, a string of characters not including the string
+`]]>`, and the string `]]>`.
+
+An [HTML tag](@) consists of an [open tag], a [closing tag],
+an [HTML comment], a [processing instruction], a [declaration],
+or a [CDATA section].
+
+Here are some simple open tags:
+
+```````````````````````````````` example
+<a><bab><c2c>
+.
+<p><a><bab><c2c></p>
+````````````````````````````````
+
+
+Empty elements:
+
+```````````````````````````````` example
+<a/><b2/>
+.
+<p><a/><b2/></p>
+````````````````````````````````
+
+
+[Whitespace] is allowed:
+
+```````````````````````````````` example
+<a  /><b2
+data="foo" >
+.
+<p><a  /><b2
+data="foo" ></p>
+````````````````````````````````
+
+
+With attributes:
+
+```````````````````````````````` example
+<a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 />
+.
+<p><a foo="bar" bam = 'baz <em>"</em>'
+_boolean zoop:33=zoop:33 /></p>
+````````````````````````````````
+
+
+Custom tag names can be used:
+
+```````````````````````````````` example
+Foo <responsive-image src="foo.jpg" />
+.
+<p>Foo <responsive-image src="foo.jpg" /></p>
+````````````````````````````````
+
+
+Illegal tag names, not parsed as HTML:
+
+```````````````````````````````` example
+<33> <__>
+.
+<p>&lt;33&gt; &lt;__&gt;</p>
+````````````````````````````````
+
+
+Illegal attribute names:
+
+```````````````````````````````` example
+<a h*#ref="hi">
+.
+<p>&lt;a h*#ref=&quot;hi&quot;&gt;</p>
+````````````````````````````````
+
+
+Illegal attribute values:
+
+```````````````````````````````` example
+<a href="hi'> <a href=hi'>
+.
+<p>&lt;a href=&quot;hi'&gt; &lt;a href=hi'&gt;</p>
+````````````````````````````````
+
+
+Illegal [whitespace]:
+
+```````````````````````````````` example
+< a><
+foo><bar/ >
+<foo bar=baz
+bim!bop />
+.
+<p>&lt; a&gt;&lt;
+foo&gt;&lt;bar/ &gt;
+&lt;foo bar=baz
+bim!bop /&gt;</p>
+````````````````````````````````
+
+
+Missing [whitespace]:
+
+```````````````````````````````` example
+<a href='bar'title=title>
+.
+<p>&lt;a href='bar'title=title&gt;</p>
+````````````````````````````````
+
+
+Closing tags:
+
+```````````````````````````````` example
+</a></foo >
+.
+<p></a></foo ></p>
+````````````````````````````````
+
+
+Illegal attributes in closing tag:
+
+```````````````````````````````` example
+</a href="foo">
+.
+<p>&lt;/a href=&quot;foo&quot;&gt;</p>
+````````````````````````````````
+
+
+Comments:
+
+```````````````````````````````` example
+foo <!-- this is a
+comment - with hyphen -->
+.
+<p>foo <!-- this is a
+comment - with hyphen --></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo <!-- not a comment -- two hyphens -->
+.
+<p>foo &lt;!-- not a comment -- two hyphens --&gt;</p>
+````````````````````````````````
+
+
+Not comments:
+
+```````````````````````````````` example
+foo <!--> foo -->
+
+foo <!-- foo--->
+.
+<p>foo &lt;!--&gt; foo --&gt;</p>
+<p>foo &lt;!-- foo---&gt;</p>
+````````````````````````````````
+
+
+Processing instructions:
+
+```````````````````````````````` example
+foo <?php echo $a; ?>
+.
+<p>foo <?php echo $a; ?></p>
+````````````````````````````````
+
+
+Declarations:
+
+```````````````````````````````` example
+foo <!ELEMENT br EMPTY>
+.
+<p>foo <!ELEMENT br EMPTY></p>
+````````````````````````````````
+
+
+CDATA sections:
+
+```````````````````````````````` example
+foo <![CDATA[>&<]]>
+.
+<p>foo <![CDATA[>&<]]></p>
+````````````````````````````````
+
+
+Entity and numeric character references are preserved in HTML
+attributes:
+
+```````````````````````````````` example
+foo <a href="&ouml;">
+.
+<p>foo <a href="&ouml;"></p>
+````````````````````````````````
+
+
+Backslash escapes do not work in HTML attributes:
+
+```````````````````````````````` example
+foo <a href="\*">
+.
+<p>foo <a href="\*"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<a href="\"">
+.
+<p>&lt;a href=&quot;&quot;&quot;&gt;</p>
+````````````````````````````````
+
+
+<div class="extension">
+
+## Disallowed Raw HTML (extension)
+
+GFM enables the `tagfilter` extension, where the following HTML tags will be
+filtered when rendering HTML output:
+
+* `<title>`
+* `<textarea>`
+* `<style>`
+* `<xmp>`
+* `<iframe>`
+* `<noembed>`
+* `<noframes>`
+* `<script>`
+* `<plaintext>`
+
+Filtering is done by replacing the leading `<` with the entity `&lt;`.  These
+tags are chosen in particular as they change how HTML is interpreted in a way
+unique to them (i.e. nested HTML is interpreted differently), and this is
+usually undesireable in the context of other rendered Markdown content.
+
+All other HTML tags are left untouched.
+
+```````````````````````````````` example tagfilter
+<strong> <title> <style> <em>
+
+<blockquote>
+  <xmp> is disallowed.  <XMP> is also disallowed.
+</blockquote>
+.
+<p><strong> &lt;title> &lt;style> <em></p>
+<blockquote>
+  &lt;xmp> is disallowed.  &lt;XMP> is also disallowed.
+</blockquote>
+````````````````````````````````
+
+</div>
+
+## Hard line breaks
+
+A line break (not in a code span or HTML tag) that is preceded
+by two or more spaces and does not occur at the end of a block
+is parsed as a [hard line break](@) (rendered
+in HTML as a `<br />` tag):
+
+```````````````````````````````` example
+foo
+baz
+.
+<p>foo<br />
+baz</p>
+````````````````````````````````
+
+
+For a more visible alternative, a backslash before the
+[line ending] may be used instead of two spaces:
+
+```````````````````````````````` example
+foo\
+baz
+.
+<p>foo<br />
+baz</p>
+````````````````````````````````
+
+
+More than two spaces can be used:
+
+```````````````````````````````` example
+foo
+baz
+.
+<p>foo<br />
+baz</p>
+````````````````````````````````
+
+
+Leading spaces at the beginning of the next line are ignored:
+
+```````````````````````````````` example
+foo
+     bar
+.
+<p>foo<br />
+bar</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo\
+     bar
+.
+<p>foo<br />
+bar</p>
+````````````````````````````````
+
+
+Line breaks can occur inside emphasis, links, and other constructs
+that allow inline content:
+
+```````````````````````````````` example
+*foo
+bar*
+.
+<p><em>foo<br />
+bar</em></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+*foo\
+bar*
+.
+<p><em>foo<br />
+bar</em></p>
+````````````````````````````````
+
+
+Line breaks do not occur inside code spans
+
+```````````````````````````````` example
+`code
+span`
+.
+<p><code>code   span</code></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+`code\
+span`
+.
+<p><code>code\ span</code></p>
+````````````````````````````````
+
+
+or HTML tags:
+
+```````````````````````````````` example
+<a href="foo
+bar">
+.
+<p><a href="foo
+bar"></p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+<a href="foo\
+bar">
+.
+<p><a href="foo\
+bar"></p>
+````````````````````````````````
+
+
+Hard line breaks are for separating inline content within a block.
+Neither syntax for hard line breaks works at the end of a paragraph or
+other block element:
+
+```````````````````````````````` example
+foo\
+.
+<p>foo\</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+foo
+.
+<p>foo</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+### foo\
+.
+<h3>foo\</h3>
+````````````````````````````````
+
+
+```````````````````````````````` example
+### foo
+.
+<h3>foo</h3>
+````````````````````````````````
+
+
+## Soft line breaks
+
+A regular line break (not in a code span or HTML tag) that is not
+preceded by two or more spaces or a backslash is parsed as a
+[softbreak](@).  (A softbreak may be rendered in HTML either as a
+[line ending] or as a space. The result will be the same in
+browsers. In the examples here, a [line ending] will be used.)
+
+```````````````````````````````` example
+foo
+baz
+.
+<p>foo
+baz</p>
+````````````````````````````````
+
+
+Spaces at the end of the line and beginning of the next line are
+removed:
+
+```````````````````````````````` example
+foo
+ baz
+.
+<p>foo
+baz</p>
+````````````````````````````````
+
+
+A conforming parser may render a soft line break in HTML either as a
+line break or as a space.
+
+A renderer may also provide an option to render soft line breaks
+as hard line breaks.
+
+## Textual content
+
+Any characters not given an interpretation by the above rules will
+be parsed as plain textual content.
+
+```````````````````````````````` example
+hello $.;'there
+.
+<p>hello $.;'there</p>
+````````````````````````````````
+
+
+```````````````````````````````` example
+Foo χρῆν
+.
+<p>Foo χρῆν</p>
+````````````````````````````````
+
+
+Internal spaces are preserved verbatim:
+
+```````````````````````````````` example
+Multiple     spaces
+.
+<p>Multiple     spaces</p>
+````````````````````````````````
+
+
+<!-- END TESTS -->
+
+# Appendix: A parsing strategy
+
+In this appendix we describe some features of the parsing strategy
+used in the CommonMark reference implementations.
+
+## Overview
+
+Parsing has two phases:
+
+1. In the first phase, lines of input are consumed and the block
+structure of the document---its division into paragraphs, block quotes,
+list items, and so on---is constructed.  Text is assigned to these
+blocks but not parsed. Link reference definitions are parsed and a
+map of links is constructed.
+
+2. In the second phase, the raw text contents of paragraphs and headings
+are parsed into sequences of Markdown inline elements (strings,
+code spans, links, emphasis, and so on), using the map of link
+references constructed in phase 1.
+
+At each point in processing, the document is represented as a tree of
+**blocks**.  The root of the tree is a `document` block.  The `document`
+may have any number of other blocks as **children**.  These children
+may, in turn, have other blocks as children.  The last child of a block
+is normally considered **open**, meaning that subsequent lines of input
+can alter its contents.  (Blocks that are not open are **closed**.)
+Here, for example, is a possible document tree, with the open blocks
+marked by arrows:
+
+``` tree
+-> document
+  -> block_quote
+       paragraph
+         "Lorem ipsum dolor\nsit amet."
+    -> list (type=bullet tight=true bullet_char=-)
+         list_item
+           paragraph
+             "Qui *quodsi iracundia*"
+      -> list_item
+        -> paragraph
+             "aliquando id"
+```
+
+## Phase 1: block structure
+
+Each line that is processed has an effect on this tree.  The line is
+analyzed and, depending on its contents, the document may be altered
+in one or more of the following ways:
+
+1. One or more open blocks may be closed.
+2. One or more new blocks may be created as children of the
+   last open block.
+3. Text may be added to the last (deepest) open block remaining
+   on the tree.
+
+Once a line has been incorporated into the tree in this way,
+it can be discarded, so input can be read in a stream.
+
+For each line, we follow this procedure:
+
+1. First we iterate through the open blocks, starting with the
+root document, and descending through last children down to the last
+open block.  Each block imposes a condition that the line must satisfy
+if the block is to remain open.  For example, a block quote requires a
+`>` character.  A paragraph requires a non-blank line.
+In this phase we may match all or just some of the open
+blocks.  But we cannot close unmatched blocks yet, because we may have a
+[lazy continuation line].
+
+2.  Next, after consuming the continuation markers for existing
+blocks, we look for new block starts (e.g. `>` for a block quote).
+If we encounter a new block start, we close any blocks unmatched
+in step 1 before creating the new block as a child of the last
+matched block.
+
+3.  Finally, we look at the remainder of the line (after block
+markers like `>`, list markers, and indentation have been consumed).
+This is text that can be incorporated into the last open
+block (a paragraph, code block, heading, or raw HTML).
+
+Setext headings are formed when we see a line of a paragraph
+that is a [setext heading underline].
+
+Reference link definitions are detected when a paragraph is closed;
+the accumulated text lines are parsed to see if they begin with
+one or more reference link definitions.  Any remainder becomes a
+normal paragraph.
+
+We can see how this works by considering how the tree above is
+generated by four lines of Markdown:
+
+``` markdown
+> Lorem ipsum dolor
+sit amet.
+> - Qui *quodsi iracundia*
+> - aliquando id
+```
+
+At the outset, our document model is just
+
+``` tree
+-> document
+```
+
+The first line of our text,
+
+``` markdown
+> Lorem ipsum dolor
+```
+
+causes a `block_quote` block to be created as a child of our
+open `document` block, and a `paragraph` block as a child of
+the `block_quote`.  Then the text is added to the last open
+block, the `paragraph`:
+
+``` tree
+-> document
+  -> block_quote
+    -> paragraph
+         "Lorem ipsum dolor"
+```
+
+The next line,
+
+``` markdown
+sit amet.
+```
+
+is a "lazy continuation" of the open `paragraph`, so it gets added
+to the paragraph's text:
+
+``` tree
+-> document
+  -> block_quote
+    -> paragraph
+         "Lorem ipsum dolor\nsit amet."
+```
+
+The third line,
+
+``` markdown
+> - Qui *quodsi iracundia*
+```
+
+causes the `paragraph` block to be closed, and a new `list` block
+opened as a child of the `block_quote`.  A `list_item` is also
+added as a child of the `list`, and a `paragraph` as a child of
+the `list_item`.  The text is then added to the new `paragraph`:
+
+``` tree
+-> document
+  -> block_quote
+       paragraph
+         "Lorem ipsum dolor\nsit amet."
+    -> list (type=bullet tight=true bullet_char=-)
+      -> list_item
+        -> paragraph
+             "Qui *quodsi iracundia*"
+```
+
+The fourth line,
+
+``` markdown
+> - aliquando id
+```
+
+causes the `list_item` (and its child the `paragraph`) to be closed,
+and a new `list_item` opened up as child of the `list`.  A `paragraph`
+is added as a child of the new `list_item`, to contain the text.
+We thus obtain the final tree:
+
+``` tree
+-> document
+  -> block_quote
+       paragraph
+         "Lorem ipsum dolor\nsit amet."
+    -> list (type=bullet tight=true bullet_char=-)
+         list_item
+           paragraph
+             "Qui *quodsi iracundia*"
+      -> list_item
+        -> paragraph
+             "aliquando id"
+```
+
+## Phase 2: inline structure
+
+Once all of the input has been parsed, all open blocks are closed.
+
+We then "walk the tree," visiting every node, and parse raw
+string contents of paragraphs and headings as inlines.  At this
+point we have seen all the link reference definitions, so we can
+resolve reference links as we go.
+
+``` tree
+document
+  block_quote
+    paragraph
+      str "Lorem ipsum dolor"
+      softbreak
+      str "sit amet."
+    list (type=bullet tight=true bullet_char=-)
+      list_item
+        paragraph
+          str "Qui "
+          emph
+            str "quodsi iracundia"
+      list_item
+        paragraph
+          str "aliquando id"
+```
+
+Notice how the [line ending] in the first paragraph has
+been parsed as a `softbreak`, and the asterisks in the first list item
+have become an `emph`.
+
+### An algorithm for parsing nested emphasis and links
+
+By far the trickiest part of inline parsing is handling emphasis,
+strong emphasis, links, and images.  This is done using the following
+algorithm.
+
+When we're parsing inlines and we hit either
+
+- a run of `*` or `_` characters, or
+- a `[` or `![`
+
+we insert a text node with these symbols as its literal content, and we
+add a pointer to this text node to the [delimiter stack](@).
+
+The [delimiter stack] is a doubly linked list.  Each
+element contains a pointer to a text node, plus information about
+
+- the type of delimiter (`[`, `![`, `*`, `_`)
+- the number of delimiters,
+- whether the delimiter is "active" (all are active to start), and
+- whether the delimiter is a potential opener, a potential closer,
+  or both (which depends on what sort of characters precede
+  and follow the delimiters).
+
+When we hit a `]` character, we call the *look for link or image*
+procedure (see below).
+
+When we hit the end of the input, we call the *process emphasis*
+procedure (see below), with `stack_bottom` = NULL.
+
+#### *look for link or image*
+
+Starting at the top of the delimiter stack, we look backwards
+through the stack for an opening `[` or `![` delimiter.
+
+- If we don't find one, we return a literal text node `]`.
+
+- If we do find one, but it's not *active*, we remove the inactive
+  delimiter from the stack, and return a literal text node `]`.
+
+- If we find one and it's active, then we parse ahead to see if
+  we have an inline link/image, reference link/image, compact reference
+  link/image, or shortcut reference link/image.
+
+  + If we don't, then we remove the opening delimiter from the
+    delimiter stack and return a literal text node `]`.
+
+  + If we do, then
+
+    * We return a link or image node whose children are the inlines
+      after the text node pointed to by the opening delimiter.
+
+    * We run *process emphasis* on these inlines, with the `[` opener
+      as `stack_bottom`.
+
+    * We remove the opening delimiter.
+
+    * If we have a link (and not an image), we also set all
+      `[` delimiters before the opening delimiter to *inactive*.  (This
+      will prevent us from getting links within links.)
+
+#### *process emphasis*
+
+Parameter `stack_bottom` sets a lower bound to how far we
+descend in the [delimiter stack].  If it is NULL, we can
+go all the way to the bottom.  Otherwise, we stop before
+visiting `stack_bottom`.
+
+Let `current_position` point to the element on the [delimiter stack]
+just above `stack_bottom` (or the first element if `stack_bottom`
+is NULL).
+
+We keep track of the `openers_bottom` for each delimiter
+type (`*`, `_`) and each length of the closing delimiter run
+(modulo 3).  Initialize this to `stack_bottom`.
+
+Then we repeat the following until we run out of potential
+closers:
+
+- Move `current_position` forward in the delimiter stack (if needed)
+  until we find the first potential closer with delimiter `*` or `_`.
+  (This will be the potential closer closest
+  to the beginning of the input -- the first one in parse order.)
+
+- Now, look back in the stack (staying above `stack_bottom` and
+  the `openers_bottom` for this delimiter type) for the
+  first matching potential opener ("matching" means same delimiter).
+
+- If one is found:
+
+  + Figure out whether we have emphasis or strong emphasis:
+    if both closer and opener spans have length >= 2, we have
+    strong, otherwise regular.
+
+  + Insert an emph or strong emph node accordingly, after
+    the text node corresponding to the opener.
+
+  + Remove any delimiters between the opener and closer from
+    the delimiter stack.
+
+  + Remove 1 (for regular emph) or 2 (for strong emph) delimiters
+    from the opening and closing text nodes.  If they become empty
+    as a result, remove them and remove the corresponding element
+    of the delimiter stack.  If the closing node is removed, reset
+    `current_position` to the next element in the stack.
+
+- If none is found:
+
+  + Set `openers_bottom` to the element before `current_position`.
+    (We know that there are no openers for this kind of closer up to and
+    including this point, so this puts a lower bound on future searches.)
+
+  + If the closer at `current_position` is not a potential opener,
+    remove it from the delimiter stack (since we know it can't
+    be a closer either).
+
+  + Advance `current_position` to the next element in the stack.
+
+After we're done, we remove all delimiters above `stack_bottom` from the
+delimiter stack.