Add clipboard IDL description.

index.bs

@@ -560,7 +560,7 @@ urlPrefix: https://w3c.github.io/FileAPI/#dfn-; type: dfn;
 		<div id="navigator-idl" dfn-for="Navigator">
 
 		<div class="algorithm" data-algorithm="navigator-clipboard">
-		<h4 id="h-navigator-clipboard">clipboard</h4>
+		<h4 id="h-navigator-clipboard"><dfn>clipboard</dfn></h4>
 		It is used to execute read/write operations from/to the [=system clipboard=].
 		The {{Navigator/clipboard}} getter steps are to return [=this=]'s [=clipboard=] object.
 		</div>
@@ -655,7 +655,7 @@ urlPrefix: https://w3c.github.io/FileAPI/#dfn-; type: dfn;
 		The <dfn constructor for="ClipboardItem" lt="ClipboardItem(items, options)"><code>new ClipboardItem(<var>items</var>, <var>options</var>)</code></dfn> constructor steps are:
 			1. If |items| is empty, then throw a {{TypeError}}.
 
-			1. If |options| is empty, then set |options| to "unspecified".
+			1. If |options| is empty, then set options["presentationStyle"] = "unspecified".
 
 			1. Set [=this=]'s [=ClipboardItem/clipboard item=] to a new [=/clipboard item=].
 
@@ -757,9 +757,8 @@ urlPrefix: https://w3c.github.io/FileAPI/#dfn-; type: dfn;
 		};
 		</pre>
 
-		Some methods of the {{Clipboard}} interface take or return multiple {{ClipboardItem}} objects. However, not all platforms support more than one [=/clipboard item=]; on such platforms, the algorithms below will ignore any {{ClipboardItem}} objects beyond the first one that are passed to {{Clipboard/write()}}, and {{Clipboard/read()}} and {{Clipboard/readText()}} will only ever return a single-item array.
+		Some methods of the {{Clipboard}} interface take or return multiple {{ClipboardItem}} objects. However, not all platforms support more than one [=/clipboard item=]; on such platforms, the algorithms below will ignore any {{ClipboardItem}} objects beyond the first one that are passed to {{Clipboard/write()}}, and {{Clipboard/read()}} and {{Clipboard/readText()}} only get one clipboard item from the OS.
 
-		A {{Clipboard}} object has an associated <dfn>clipboard</dfn>.
 		A <dfn>clipboard items</dfn> object is a [=sequence=] of [=/clipboard item=]s.
 
 		<p class="note">
@@ -790,6 +789,8 @@ urlPrefix: https://w3c.github.io/FileAPI/#dfn-; type: dfn;
 
 				1. Let |data| be a copy of the [=system clipboard data=] represented as [=clipboard items=]. For the MIME types defined in the [=mandatory data types=] list, |data| contains the sanitized copy of text/html format, but image/png format has unsanitized payload to preserve meta data.
 
+					Issue: Some OSs contain multiple clipboard (e.g. Linux, "primary", "secondary", "selection"). Define from which of those data is read.
+
 					Note: As further described in [[#image-transcode]] this explicitly does not transcode images.
 					Rather the original unmodified image data should be exposed to the website.
 
@@ -839,11 +840,13 @@ urlPrefix: https://w3c.github.io/FileAPI/#dfn-; type: dfn;
 
 				1. Let |data| be a copy of the [=system clipboard data=] represented as [=clipboard items=]. For the MIME types defined in the [=mandatory data types=] list, |data| contains the sanitized copy of text/plain format.
 
+					Issue: Some OSs contain multiple clipboard (e.g. Linux, "primary", "secondary", "selection"). Define from which of those data is read.
+
 					Issue: Add definition of sanitized copy.
 
 				1. [=Queue a global task=] on the [=clipboard task source=], given |realm|'s [=Realm/global object=], to perform the below steps:
 
-					1. Let |dataList| be a [=sequence=]&lt;{{ClipboardItem}}&gt;.
+					1. Let |dataList| be a [=sequence=] of [=/clipboard item=]s.
 
 					1. If |data|'s [=list/size=] is greater than 1, then add |data|[0] to |dataList|.
 
@@ -1621,6 +1624,8 @@ urlPrefix: https://w3c.github.io/FileAPI/#dfn-; type: dfn;
 
 			1. Insert |payload| and |presentationStyle| into the [=system clipboard=] using |formatString| as the native clipboard format.
 
+			Issue: some OSs contain multiple clipboard (e.g. Linux, "primary", "secondary", "selection"). Define from which of those data is written.
+
 	</div><!-- algorithm -->
 
 	<div class="algorithm" data-algorithm="os-specific-well-known-format">