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+++ b/index.html
@@ -4,9 +4,9 @@
   <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
   <title>WebCodecs</title>
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-  <meta content="Bikeshed version c6f50773a, updated Fri Apr 16 16:45:47 2021 -0700" name="generator">
+  <meta content="Bikeshed version 5c7bc9381, updated Wed May 12 18:18:08 2021 -0700" name="generator">
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-  <meta content="731a471521045c83b0cae837f20cd666731b4a17" name="document-revision">
+  <meta content="fcada57b2194e805664e3af6bb6b200752116c21" name="document-revision">
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@@ -572,7 +572,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2016/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">WebCodecs</h1>
-   <h2 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">Editor’s Draft, <time class="dt-updated" datetime="2021-05-12">12 May 2021</time></span></h2>
+   <h2 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">Editor’s Draft, <time class="dt-updated" datetime="2021-05-13">13 May 2021</time></span></h2>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version:
@@ -701,14 +701,18 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
       <li>
        <a href="#encodedaudiochunk-interface"><span class="secno">8.1</span> <span class="content">EncodedAudioChunk Interface</span></a>
        <ol class="toc">
-        <li><a href="#encodedaudiochunk-constructors"><span class="secno">8.1.1</span> <span class="content">Constructors</span></a>
-        <li><a href="#encodedaudiochunk-attributes"><span class="secno">8.1.2</span> <span class="content">Attributes</span></a>
+        <li><a href="#encodedaudiochunk-internal-slots"><span class="secno">8.1.1</span> <span class="content">Internal Slots</span></a>
+        <li><a href="#encodedaudiochunk-constructors"><span class="secno">8.1.2</span> <span class="content">Constructors</span></a>
+        <li><a href="#encodedaudiochunk-attributes"><span class="secno">8.1.3</span> <span class="content">Attributes</span></a>
+        <li><a href="#encodedaudiochunk-methods"><span class="secno">8.1.4</span> <span class="content">Methods</span></a>
        </ol>
       <li>
        <a href="#encodedvideochunk-interface"><span class="secno">8.2</span> <span class="content">EncodedVideoChunk Interface</span></a>
        <ol class="toc">
-        <li><a href="#encodedvideochunk-constructors"><span class="secno">8.2.1</span> <span class="content">Constructors</span></a>
-        <li><a href="#encodedvideochunk-attributes"><span class="secno">8.2.2</span> <span class="content">Attributes</span></a>
+        <li><a href="#encodedvideochunk-internal-slots"><span class="secno">8.2.1</span> <span class="content">Internal Slots</span></a>
+        <li><a href="#encodedvideochunk-constructors"><span class="secno">8.2.2</span> <span class="content">Constructors</span></a>
+        <li><a href="#encodedvideochunk-attributes"><span class="secno">8.2.3</span> <span class="content">Attributes</span></a>
+        <li><a href="#encodedvideochunk-methods"><span class="secno">8.2.4</span> <span class="content">Methods</span></a>
        </ol>
      </ol>
     <li>
@@ -2348,7 +2352,9 @@ <h3 class="heading settled" data-level="8.1" id="encodedaudiochunk-interface"><s
   <a class="idl-code" data-link-type="constructor" href="#dom-encodedaudiochunk-encodedaudiochunk" id="ref-for-dom-encodedaudiochunk-encodedaudiochunk"><c- g>constructor</c-></a>(<a data-link-type="idl-name" href="#dictdef-encodedaudiochunkinit" id="ref-for-dictdef-encodedaudiochunkinit①"><c- n>EncodedAudioChunkInit</c-></a> <dfn class="idl-code" data-dfn-for="EncodedAudioChunk/EncodedAudioChunk(init), EncodedAudioChunk/constructor(init)" data-dfn-type="argument" data-export id="dom-encodedaudiochunk-encodedaudiochunk-init-init"><code><c- g>init</c-></code><a class="self-link" href="#dom-encodedaudiochunk-encodedaudiochunk-init-init"></a></dfn>);
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-encodedaudiochunktype" id="ref-for-enumdef-encodedaudiochunktype①"><c- n>EncodedAudioChunkType</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="EncodedAudioChunkType" href="#dom-encodedaudiochunk-type" id="ref-for-dom-encodedaudiochunk-type"><c- g>type</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long④"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long" href="#dom-encodedaudiochunk-timestamp" id="ref-for-dom-encodedaudiochunk-timestamp①"><c- g>timestamp</c-></a>;  // microseconds
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer"><c- b>ArrayBuffer</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-encodedaudiochunk-data" id="ref-for-dom-encodedaudiochunk-data"><c- g>data</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-encodedaudiochunk-bytelength" id="ref-for-dom-encodedaudiochunk-bytelength"><c- g>byteLength</c-></a>;
+
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑤"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-encodedaudiochunk-copyto" id="ref-for-dom-encodedaudiochunk-copyto"><c- g>copyTo</c-></a>(<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#ArrayBufferView" id="ref-for-ArrayBufferView"><c- n>ArrayBufferView</c-></a> <dfn class="idl-code" data-dfn-for="EncodedAudioChunk/copyTo(dst)" data-dfn-type="argument" data-export id="dom-encodedaudiochunk-copyto-dst-dst"><code><c- g>dst</c-></code><a class="self-link" href="#dom-encodedaudiochunk-copyto-dst-dst"></a></dfn>);
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-encodedaudiochunkinit"><code><c- g>EncodedAudioChunkInit</c-></code></dfn> {
@@ -2362,30 +2368,55 @@ <h3 class="heading settled" data-level="8.1" id="encodedaudiochunk-interface"><s
     <dfn class="idl-code" data-dfn-for="EncodedAudioChunkType" data-dfn-type="enum-value" data-export id="dom-encodedaudiochunktype-delta"><code><c- s>"delta"</c-></code><a class="self-link" href="#dom-encodedaudiochunktype-delta"></a></dfn>,
 };
 </pre>
-   <h4 class="heading settled" data-level="8.1.1" id="encodedaudiochunk-constructors"><span class="secno">8.1.1. </span><span class="content">Constructors</span><a class="self-link" href="#encodedaudiochunk-constructors"></a></h4>
+   <h4 class="heading settled" data-level="8.1.1" id="encodedaudiochunk-internal-slots"><span class="secno">8.1.1. </span><span class="content">Internal Slots</span><a class="self-link" href="#encodedaudiochunk-internal-slots"></a></h4>
+   <dl>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-internal-data-slot"><code>[[internal data]]</code></dfn>
+    <p></p>
+    <dd data-md>
+     <p>An array of bytes representing the encoded chunk data.</p>
+   </dl>
+   <h4 class="heading settled" data-level="8.1.2" id="encodedaudiochunk-constructors"><span class="secno">8.1.2. </span><span class="content">Constructors</span><a class="self-link" href="#encodedaudiochunk-constructors"></a></h4>
     <dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="constructor" data-export data-lt="EncodedAudioChunk(init)|constructor(init)" id="dom-encodedaudiochunk-encodedaudiochunk" title="EncodedAudioChunk(init)"><code> EncodedAudioChunk(init) </code></dfn> 
    <ol>
     <li data-md>
      <p>Let <var>chunk</var> be a new <code class="idl"><a data-link-type="idl" href="#encodedaudiochunk" id="ref-for-encodedaudiochunk④">EncodedAudioChunk</a></code> object, initialized as follows</p>
      <ol>
       <li data-md>
-       <p>Assign <code>init.type</code> to <code>chunk.type</code>.</p>
+       <p>Assign <code>init.type</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-type" id="ref-for-dom-encodedaudiochunk-type①">type</a></code>.</p>
       <li data-md>
-       <p>Assign <code>init.timestamp</code> to <code>chunk.timestamp</code>.</p>
+       <p>Assign <code>init.timestamp</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-timestamp" id="ref-for-dom-encodedaudiochunk-timestamp②">timestamp</a></code>.</p>
       <li data-md>
-       <p>Assign a copy of <code>init.data</code> to <code>chunk.data</code>.</p>
+       <p>Assign a copy of <code>init.data</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-internal-data-slot" id="ref-for-dom-encodedaudiochunk-internal-data-slot">[[internal data]]</a></code>.</p>
+      <li data-md>
+       <p>Assign <code>init.data.byteLength</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-bytelength" id="ref-for-dom-encodedaudiochunk-bytelength①">byteLength</a></code>;</p>
      </ol>
     <li data-md>
      <p>Return <var>chunk</var>.</p>
    </ol>
-   <h4 class="heading settled" data-level="8.1.2" id="encodedaudiochunk-attributes"><span class="secno">8.1.2. </span><span class="content">Attributes</span><a class="self-link" href="#encodedaudiochunk-attributes"></a></h4>
+   <h4 class="heading settled" data-level="8.1.3" id="encodedaudiochunk-attributes"><span class="secno">8.1.3. </span><span class="content">Attributes</span><a class="self-link" href="#encodedaudiochunk-attributes"></a></h4>
+   <dl>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="#enumdef-encodedaudiochunktype" id="ref-for-enumdef-encodedaudiochunktype③">EncodedAudioChunkType</a>, readonly</span>
+    <dd data-md>
+     <p>Describes whether the chunk is a key frame.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-timestamp"><code>timestamp</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑥">unsigned long long</a>, readonly</span>
+    <dd data-md>
+     <p>The presentation timestamp, given in microseconds.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-bytelength"><code>byteLength</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③③">unsigned long</a>, readonly</span>
+    <dd data-md>
+     <p>The byte length of <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-internal-data-slot" id="ref-for-dom-encodedaudiochunk-internal-data-slot①">[[internal data]]</a></code>.</p>
+   </dl>
+   <h4 class="heading settled" data-level="8.1.4" id="encodedaudiochunk-methods"><span class="secno">8.1.4. </span><span class="content">Methods</span><a class="self-link" href="#encodedaudiochunk-methods"></a></h4>
    <dl>
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="#enumdef-encodedaudiochunktype" id="ref-for-enumdef-encodedaudiochunktype③">EncodedAudioChunkType</a>, readonly</span>
-    <dd>Describes whether the chunk is a key frame.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-timestamp"><code>timestamp</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑥">unsigned long long</a>, readonly</span>
-    <dd>The presentation timestamp, given in microseconds.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="attribute" data-export id="dom-encodedaudiochunk-data"><code>data</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①">ArrayBuffer</a>, readonly</span>
-    <dd>A sequence of bytes containing encoded audio data.
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedAudioChunk" data-dfn-type="method" data-export id="dom-encodedaudiochunk-copyto"><code>copyTo(dst)</code></dfn>
+    <dd data-md>
+     <p>When invoked, run these steps:</p>
+     <ol>
+      <li data-md>
+       <p>If <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-bytelength" id="ref-for-dom-encodedaudiochunk-bytelength②">byteLength</a></code> is greater than <var>dst</var>.<code>byteLength</code>,
+throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⓪">TypeError</a></code>.</p>
+      <li data-md>
+       <p>Copy the <code class="idl"><a data-link-type="idl" href="#dom-encodedaudiochunk-internal-data-slot" id="ref-for-dom-encodedaudiochunk-internal-data-slot②">[[internal data]]</a></code> into <var>dst</var>.</p>
+     </ol>
    </dl>
    <h3 class="heading settled" data-level="8.2" id="encodedvideochunk-interface"><span class="secno">8.2. </span><span class="content">EncodedVideoChunk Interface</span><a class="self-link" href="#encodedvideochunk-interface"></a></h3>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://heycam.github.io/webidl/#Exposed" id="ref-for-Exposed⑤"><c- g>Exposed</c-></a>=(<c- n>Window</c->,<c- n>DedicatedWorker</c->)]
@@ -2394,7 +2425,9 @@ <h3 class="heading settled" data-level="8.2" id="encodedvideochunk-interface"><s
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-encodedvideochunktype" id="ref-for-enumdef-encodedvideochunktype①"><c- n>EncodedVideoChunkType</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="EncodedVideoChunkType" href="#dom-encodedvideochunk-type" id="ref-for-dom-encodedvideochunk-type"><c- g>type</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑦"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long" href="#dom-encodedvideochunk-timestamp" id="ref-for-dom-encodedvideochunk-timestamp①"><c- g>timestamp</c-></a>;  // microseconds
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑧"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>? <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long?" href="#dom-encodedvideochunk-duration" id="ref-for-dom-encodedvideochunk-duration①"><c- g>duration</c-></a>;  // microseconds
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②"><c- b>ArrayBuffer</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-encodedvideochunk-data" id="ref-for-dom-encodedvideochunk-data"><c- g>data</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③④"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-encodedvideochunk-bytelength" id="ref-for-dom-encodedvideochunk-bytelength"><c- g>byteLength</c-></a>;
+
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑥"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-encodedvideochunk-copyto" id="ref-for-dom-encodedvideochunk-copyto"><c- g>copyTo</c-></a>(<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#ArrayBufferView" id="ref-for-ArrayBufferView①"><c- n>ArrayBufferView</c-></a> <dfn class="idl-code" data-dfn-for="EncodedVideoChunk/copyTo(dst)" data-dfn-type="argument" data-export id="dom-encodedvideochunk-copyto-dst-dst"><code><c- g>dst</c-></code><a class="self-link" href="#dom-encodedvideochunk-copyto-dst-dst"></a></dfn>);
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-encodedvideochunkinit"><code><c- g>EncodedVideoChunkInit</c-></code></dfn> {
@@ -2409,34 +2442,60 @@ <h3 class="heading settled" data-level="8.2" id="encodedvideochunk-interface"><s
     <dfn class="idl-code" data-dfn-for="EncodedVideoChunkType" data-dfn-type="enum-value" data-export id="dom-encodedvideochunktype-delta"><code><c- s>"delta"</c-></code><a class="self-link" href="#dom-encodedvideochunktype-delta"></a></dfn>,
 };
 </pre>
-   <h4 class="heading settled" data-level="8.2.1" id="encodedvideochunk-constructors"><span class="secno">8.2.1. </span><span class="content">Constructors</span><a class="self-link" href="#encodedvideochunk-constructors"></a></h4>
+   <h4 class="heading settled" data-level="8.2.1" id="encodedvideochunk-internal-slots"><span class="secno">8.2.1. </span><span class="content">Internal Slots</span><a class="self-link" href="#encodedvideochunk-internal-slots"></a></h4>
+   <dl>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-internal-data-slot"><code>[[internal data]]</code></dfn>
+    <p></p>
+    <dd data-md>
+     <p>An array of bytes representing the encoded chunk data.</p>
+   </dl>
+   <h4 class="heading settled" data-level="8.2.2" id="encodedvideochunk-constructors"><span class="secno">8.2.2. </span><span class="content">Constructors</span><a class="self-link" href="#encodedvideochunk-constructors"></a></h4>
     <dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="constructor" data-export data-lt="EncodedVideoChunk(init)|constructor(init)" id="dom-encodedvideochunk-encodedvideochunk" title="EncodedVideoChunk(init)"><code> EncodedVideoChunk(init) </code></dfn> 
    <ol>
     <li data-md>
      <p>Let <var>chunk</var> be a new <code class="idl"><a data-link-type="idl" href="#encodedvideochunk" id="ref-for-encodedvideochunk⑨">EncodedVideoChunk</a></code> object, initialized as follows</p>
      <ol>
       <li data-md>
-       <p>Assign <code>init.type</code> to <code>chunk.type</code>.</p>
+       <p>Assign <code>init.type</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-type" id="ref-for-dom-encodedvideochunk-type①">type</a></code>.</p>
       <li data-md>
-       <p>Assign <code>init.timestamp</code> to <code>chunk.timestamp</code>.</p>
+       <p>Assign <code>init.timestamp</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-timestamp" id="ref-for-dom-encodedvideochunk-timestamp②">timestamp</a></code>.</p>
       <li data-md>
-       <p>If duration is present in init, assign <code>init.duration</code> to <code>chunk.duration</code>. Otherwise, assign null to <code>chunk.duration</code>.</p>
+       <p>If duration is present in init, assign <code>init.duration</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-duration" id="ref-for-dom-encodedvideochunk-duration②">duration</a></code>. Otherwise, assign <code>null</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-duration" id="ref-for-dom-encodedvideochunk-duration③">duration</a></code>.</p>
+      <li data-md>
+       <p>Assign a copy of <code>init.data</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-internal-data-slot" id="ref-for-dom-encodedvideochunk-internal-data-slot">[[internal data]]</a></code>.</p>
+      <li data-md>
+       <p>Assign <code>init.data.byteLength</code> to <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-bytelength" id="ref-for-dom-encodedvideochunk-bytelength①">byteLength</a></code>;</p>
      </ol>
-    <li data-md>
-     <p>Assign a copy of <code>init.data</code> to <code>chunk.data</code>.</p>
     <li data-md>
      <p>Return <var>chunk</var>.</p>
    </ol>
-   <h4 class="heading settled" data-level="8.2.2" id="encodedvideochunk-attributes"><span class="secno">8.2.2. </span><span class="content">Attributes</span><a class="self-link" href="#encodedvideochunk-attributes"></a></h4>
+   <h4 class="heading settled" data-level="8.2.3" id="encodedvideochunk-attributes"><span class="secno">8.2.3. </span><span class="content">Attributes</span><a class="self-link" href="#encodedvideochunk-attributes"></a></h4>
    <dl>
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="#enumdef-encodedvideochunktype" id="ref-for-enumdef-encodedvideochunktype③">EncodedVideoChunkType</a>, readonly</span>
-    <dd>Describes whether the chunk is a key frame or not.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-timestamp"><code>timestamp</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①①">unsigned long long</a>, readonly</span>
-    <dd>The presentation timestamp, given in microseconds.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-duration"><code>duration</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①②">unsigned long long</a>, readonly, nullable</span>
-    <dd>The presentation duration, given in microseconds.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-data"><code>data</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer③">ArrayBuffer</a>, readonly</span>
-    <dd>A sequence of bytes containing encoded video data.
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="#enumdef-encodedvideochunktype" id="ref-for-enumdef-encodedvideochunktype③">EncodedVideoChunkType</a>, readonly</span>
+    <dd data-md>
+     <p>Describes whether the chunk is a key frame or not.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-timestamp"><code>timestamp</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①①">unsigned long long</a>, readonly</span>
+    <dd data-md>
+     <p>The presentation timestamp, given in microseconds.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-duration"><code>duration</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①②">unsigned long long</a>, readonly, nullable</span>
+    <dd data-md>
+     <p>The presentation duration, given in microseconds.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="attribute" data-export id="dom-encodedvideochunk-bytelength"><code>byteLength</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑤">unsigned long</a>, readonly</span>
+    <dd data-md>
+     <p>The byte length of <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-internal-data-slot" id="ref-for-dom-encodedvideochunk-internal-data-slot①">[[internal data]]</a></code>.</p>
+   </dl>
+   <h4 class="heading settled" data-level="8.2.4" id="encodedvideochunk-methods"><span class="secno">8.2.4. </span><span class="content">Methods</span><a class="self-link" href="#encodedvideochunk-methods"></a></h4>
+   <dl>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="EncodedVideoChunk" data-dfn-type="method" data-export id="dom-encodedvideochunk-copyto"><code>copyTo(dst)</code></dfn>
+    <dd data-md>
+     <p>When invoked, run these steps:</p>
+     <ol>
+      <li data-md>
+       <p>If <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-bytelength" id="ref-for-dom-encodedvideochunk-bytelength②">byteLength</a></code> is greater than <var>dst</var>.<code>byteLength</code>,
+throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①①">TypeError</a></code>.</p>
+      <li data-md>
+       <p>Copy the <code class="idl"><a data-link-type="idl" href="#dom-encodedvideochunk-internal-data-slot" id="ref-for-dom-encodedvideochunk-internal-data-slot②">[[internal data]]</a></code> into <var>dst</var>.</p>
+     </ol>
    </dl>
    <h2 class="heading settled" data-level="9" id="raw-media-interfaces"><span class="secno">9. </span><span class="content">Raw Media Interfaces</span><a class="self-link" href="#raw-media-interfaces"></a></h2>
     These interfaces represent unencoded (raw) media. 
@@ -2467,22 +2526,22 @@ <h3 class="heading settled" data-level="9.2" id="audiodata-interface"><span clas
 
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-audiosampleformat" id="ref-for-enumdef-audiosampleformat"><c- n>AudioSampleFormat</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="AudioSampleFormat" href="#dom-audiodata-sampleformat" id="ref-for-dom-audiodata-sampleformat"><c- g>sampleFormat</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-float" id="ref-for-idl-float"><c- b>float</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="float" href="#dom-audiodata-samplerate" id="ref-for-dom-audiodata-samplerate"><c- g>sampleRate</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-audiodata-numberofframes" id="ref-for-dom-audiodata-numberofframes"><c- g>numberOfFrames</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③③"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-audiodata-numberofchannels" id="ref-for-dom-audiodata-numberofchannels"><c- g>numberOfChannels</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③④"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-audiodata-allocationsize" id="ref-for-dom-audiodata-allocationsize"><c- g>allocationSize</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-audiodata-numberofframes" id="ref-for-dom-audiodata-numberofframes"><c- g>numberOfFrames</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑦"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-audiodata-numberofchannels" id="ref-for-dom-audiodata-numberofchannels"><c- g>numberOfChannels</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑧"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-audiodata-allocationsize" id="ref-for-dom-audiodata-allocationsize"><c- g>allocationSize</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①③"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long" href="#dom-audiodata-duration" id="ref-for-dom-audiodata-duration"><c- g>duration</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①④"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long" href="#dom-audiodata-timestamp" id="ref-for-dom-audiodata-timestamp①"><c- g>timestamp</c-></a>;
 
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑤"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-audiodata-copyto" id="ref-for-dom-audiodata-copyto"><c- g>copyTo</c-></a>([<a class="idl-code" data-link-type="extended-attribute" href="https://heycam.github.io/webidl/#AllowShared" id="ref-for-AllowShared"><c- g>AllowShared</c-></a>] <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#BufferSource" id="ref-for-BufferSource⑥"><c- n>BufferSource</c-></a> <dfn class="idl-code" data-dfn-for="AudioData/copyTo(destination, planeNumber)" data-dfn-type="argument" data-export id="dom-audiodata-copyto-destination-planenumber-destination"><code><c- g>destination</c-></code><a class="self-link" href="#dom-audiodata-copyto-destination-planenumber-destination"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="AudioData/copyTo(destination, planeNumber)" data-dfn-type="argument" data-export id="dom-audiodata-copyto-destination-planenumber-planenumber"><code><c- g>planeNumber</c-></code><a class="self-link" href="#dom-audiodata-copyto-destination-planenumber-planenumber"></a></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑦"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-audiodata-copyto" id="ref-for-dom-audiodata-copyto"><c- g>copyTo</c-></a>([<a class="idl-code" data-link-type="extended-attribute" href="https://heycam.github.io/webidl/#AllowShared" id="ref-for-AllowShared"><c- g>AllowShared</c-></a>] <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#BufferSource" id="ref-for-BufferSource⑥"><c- n>BufferSource</c-></a> <dfn class="idl-code" data-dfn-for="AudioData/copyTo(destination, planeNumber)" data-dfn-type="argument" data-export id="dom-audiodata-copyto-destination-planenumber-destination"><code><c- g>destination</c-></code><a class="self-link" href="#dom-audiodata-copyto-destination-planenumber-destination"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="AudioData/copyTo(destination, planeNumber)" data-dfn-type="argument" data-export id="dom-audiodata-copyto-destination-planenumber-planenumber"><code><c- g>planeNumber</c-></code><a class="self-link" href="#dom-audiodata-copyto-destination-planenumber-planenumber"></a></dfn>);
   <a data-link-type="idl-name" href="#audiodata" id="ref-for-audiodata⑧"><c- n>AudioData</c-></a> <a class="idl-code" data-link-type="method" href="#dom-audiodata-clone" id="ref-for-dom-audiodata-clone①"><c- g>clone</c-></a>();
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑥"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-audiodata-close" id="ref-for-dom-audiodata-close①"><c- g>close</c-></a>();
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑧"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-audiodata-close" id="ref-for-dom-audiodata-close①"><c- g>close</c-></a>();
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-audiodatainit"><code><c- g>AudioDataInit</c-></code></dfn> {
   <c- b>required</c-> <a data-link-type="idl-name" href="#enumdef-audiosampleformat" id="ref-for-enumdef-audiosampleformat①"><c- n>AudioSampleFormat</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="AudioSampleFormat " id="dom-audiodatainit-sampleformat"><code><c- g>sampleFormat</c-></code></dfn>;
   <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-float" id="ref-for-idl-float①"><c- b>float</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="float " id="dom-audiodatainit-samplerate"><code><c- g>sampleRate</c-></code></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-audiodatainit-numberofframes"><code><c- g>numberOfFrames</c-></code></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑦"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-audiodatainit-numberofchannels"><code><c- g>numberOfChannels</c-></code></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⓪"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-audiodatainit-numberofframes"><code><c- g>numberOfFrames</c-></code></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④①"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-audiodatainit-numberofchannels"><code><c- g>numberOfChannels</c-></code></dfn>;
   <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⑤"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="unsigned long long " id="dom-audiodatainit-timestamp"><code><c- g>timestamp</c-></code></dfn>;
   <c- b>required</c-> <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#BufferSource" id="ref-for-BufferSource⑦"><c- n>BufferSource</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AudioDataInit" data-dfn-type="dict-member" data-export data-type="BufferSource " id="dom-audiodatainit-data"><code><c- g>data</c-></code></dfn>;
 };
@@ -2550,15 +2609,15 @@ <h4 class="heading settled" data-level="9.2.3" id="audiodata-attributes"><span c
     <dd data-md>
      <p>The sample-rate, in Hz, for this <code class="idl"><a data-link-type="idl" href="#audiodata" id="ref-for-audiodata①⑧">AudioData</a></code>.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-audiodata-samplerate" id="ref-for-dom-audiodata-samplerate①">sampleRate</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-audiodata-sample-rate-slot" id="ref-for-dom-audiodata-sample-rate-slot②">[[sample rate]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AudioData" data-dfn-type="attribute" data-export id="dom-audiodata-numberofframes"><code>numberOfFrames</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑧">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AudioData" data-dfn-type="attribute" data-export id="dom-audiodata-numberofframes"><code>numberOfFrames</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④②">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The number of frames (samples per channel) for this <code class="idl"><a data-link-type="idl" href="#audiodata" id="ref-for-audiodata①⑨">AudioData</a></code>.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-audiodata-numberofframes" id="ref-for-dom-audiodata-numberofframes①">numberOfFrames</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-audiodata-number-of-frames-slot" id="ref-for-dom-audiodata-number-of-frames-slot②">[[number of frames]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AudioData" data-dfn-type="attribute" data-export id="dom-audiodata-numberofchannels"><code>numberOfChannels</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long③⑨">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AudioData" data-dfn-type="attribute" data-export id="dom-audiodata-numberofchannels"><code>numberOfChannels</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④③">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The number of audio channels for this <code class="idl"><a data-link-type="idl" href="#audiodata" id="ref-for-audiodata②⓪">AudioData</a></code>.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-audiodata-numberofchannels" id="ref-for-dom-audiodata-numberofchannels①">numberOfChannels</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-audiodata-number-of-channels-slot" id="ref-for-dom-audiodata-number-of-channels-slot②">[[number of channels]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AudioData" data-dfn-type="attribute" data-export id="dom-audiodata-allocationsize"><code>allocationSize</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⓪">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AudioData" data-dfn-type="attribute" data-export id="dom-audiodata-allocationsize"><code>allocationSize</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④④">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The the number of bytes allocated to hold all of the samples in this <code class="idl"><a data-link-type="idl" href="#audiodata" id="ref-for-audiodata②①">AudioData</a></code>.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-audiodata-allocationsize" id="ref-for-dom-audiodata-allocationsize①">allocationSize</a></code> getter steps are to:</p>
@@ -2598,7 +2657,7 @@ <h4 class="heading settled" data-level="9.2.4" id="audiodata-methods"><span clas
       <li data-md>
        <p>Let <var>allocationSize</var> be the number of bytes allocated to hold this <code class="idl"><a data-link-type="idl" href="#audiodata" id="ref-for-audiodata②⑤">AudioData</a></code>'s <a data-link-type="dfn" href="#media-resource" id="ref-for-media-resource①⓪">media resource</a>, as described by the getter steps of <code class="idl"><a data-link-type="idl" href="#dom-audiodata-allocationsize" id="ref-for-dom-audiodata-allocationsize②">allocationSize</a></code>.</p>
       <li data-md>
-       <p>If <var>allocationSize</var> is greater than <code>destination.byteLength</code>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⓪">TypeError</a></code>.</p>
+       <p>If <var>allocationSize</var> is greater than <code>destination.byteLength</code>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①②">TypeError</a></code>.</p>
       <li data-md>
        <p>Let <var>resource</var> be the <a data-link-type="dfn" href="#media-resource" id="ref-for-media-resource①①">media resource</a> referenced by <code class="idl"><a data-link-type="idl" href="#dom-audiodata-resource-reference-slot" id="ref-for-dom-audiodata-resource-reference-slot③">[[resource reference]]</a></code>.</p>
       <li data-md>
@@ -2698,19 +2757,19 @@ <h3 class="heading settled" data-level="9.4" id="videoframe-interface"><span cla
 
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-pixelformat" id="ref-for-enumdef-pixelformat①"><c- n>PixelFormat</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="PixelFormat" href="#dom-videoframe-format" id="ref-for-dom-videoframe-format"><c- g>format</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-frozen-array" id="ref-for-idl-frozen-array"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#plane" id="ref-for-plane②"><c- n>Plane</c-></a>>? <a class="idl-code" data-link-type="attribute" data-readonly data-type="FrozenArray<Plane>?" href="#dom-videoframe-planes" id="ref-for-dom-videoframe-planes"><c- g>planes</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④①"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-codedwidth" id="ref-for-dom-videoframe-codedwidth"><c- g>codedWidth</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-codedheight" id="ref-for-dom-videoframe-codedheight"><c- g>codedHeight</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④③"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-cropleft" id="ref-for-dom-videoframe-cropleft"><c- g>cropLeft</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④④"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-croptop" id="ref-for-dom-videoframe-croptop"><c- g>cropTop</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-cropwidth" id="ref-for-dom-videoframe-cropwidth"><c- g>cropWidth</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-cropheight" id="ref-for-dom-videoframe-cropheight"><c- g>cropHeight</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑦"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-displaywidth" id="ref-for-dom-videoframe-displaywidth"><c- g>displayWidth</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑧"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-displayheight" id="ref-for-dom-videoframe-displayheight"><c- g>displayHeight</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-codedwidth" id="ref-for-dom-videoframe-codedwidth"><c- g>codedWidth</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-codedheight" id="ref-for-dom-videoframe-codedheight"><c- g>codedHeight</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑦"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-cropleft" id="ref-for-dom-videoframe-cropleft"><c- g>cropLeft</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑧"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-croptop" id="ref-for-dom-videoframe-croptop"><c- g>cropTop</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-cropwidth" id="ref-for-dom-videoframe-cropwidth"><c- g>cropWidth</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⓪"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-cropheight" id="ref-for-dom-videoframe-cropheight"><c- g>cropHeight</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤①"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-displaywidth" id="ref-for-dom-videoframe-displaywidth"><c- g>displayWidth</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-videoframe-displayheight" id="ref-for-dom-videoframe-displayheight"><c- g>displayHeight</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⑧"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>? <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long?" href="#dom-videoframe-duration" id="ref-for-dom-videoframe-duration"><c- g>duration</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⑨"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>? <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long?" href="#dom-videoframe-timestamp" id="ref-for-dom-videoframe-timestamp"><c- g>timestamp</c-></a>;
 
   <a data-link-type="idl-name" href="#videoframe" id="ref-for-videoframe①⑥"><c- n>VideoFrame</c-></a> <a class="idl-code" data-link-type="method" href="#dom-videoframe-clone" id="ref-for-dom-videoframe-clone①"><c- g>clone</c-></a>();
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑦"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-videoframe-close" id="ref-for-dom-videoframe-close②"><c- g>close</c-></a>();
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑨"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-videoframe-close" id="ref-for-dom-videoframe-close②"><c- g>close</c-></a>();
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-videoframeinit"><code><c- g>VideoFrameInit</c-></code></dfn> {
@@ -2720,14 +2779,14 @@ <h3 class="heading settled" data-level="9.4" id="videoframe-interface"><span cla
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-videoframeplaneinit"><code><c- g>VideoFramePlaneInit</c-></code></dfn> {
   <c- b>required</c-> <a data-link-type="idl-name" href="#enumdef-pixelformat" id="ref-for-enumdef-pixelformat②"><c- n>PixelFormat</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="PixelFormat " id="dom-videoframeplaneinit-format"><code><c- g>format</c-></code></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long④⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-codedwidth"><code><c- g>codedWidth</c-></code></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⓪"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-codedheight"><code><c- g>codedHeight</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤①"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-cropleft"><code><c- g>cropLeft</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤②"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-croptop"><code><c- g>cropTop</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤③"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-cropwidth"><code><c- g>cropWidth</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤④"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-cropheight"><code><c- g>cropHeight</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-displaywidth"><code><c- g>displayWidth</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-displayheight"><code><c- g>displayHeight</c-></code></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤③"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-codedwidth"><code><c- g>codedWidth</c-></code></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤④"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-codedheight"><code><c- g>codedHeight</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-cropleft"><code><c- g>cropLeft</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-croptop"><code><c- g>cropTop</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑦"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-cropwidth"><code><c- g>cropWidth</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑧"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-cropheight"><code><c- g>cropHeight</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-displaywidth"><code><c- g>displayWidth</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⓪"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-videoframeplaneinit-displayheight"><code><c- g>displayHeight</c-></code></dfn>;
   <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long②②"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long long " id="dom-videoframeplaneinit-duration"><code><c- g>duration</c-></code></dfn>;
   <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long②③"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="VideoFramePlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long long " id="dom-videoframeplaneinit-timestamp"><code><c- g>timestamp</c-></code></dfn>;
 };
@@ -2807,7 +2866,7 @@ <h4 class="heading settled" data-level="9.4.2" id="videoframe-constructors"><spa
        <p><code class="idl"><a data-link-type="idl" href="https://svgwg.org/svg2-draft/embedded.html#InterfaceSVGImageElement" id="ref-for-InterfaceSVGImageElement">SVGImageElement</a></code></p>
        <ol>
         <li data-md>
-         <p>If <code class="idl"><a data-link-type="idl" href="#dom-videoframeinit-timestamp" id="ref-for-dom-videoframeinit-timestamp①">timestamp</a></code> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①">exist</a> in <var>init</var>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①①">TypeError</a></code>.</p>
+         <p>If <code class="idl"><a data-link-type="idl" href="#dom-videoframeinit-timestamp" id="ref-for-dom-videoframeinit-timestamp①">timestamp</a></code> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①">exist</a> in <var>init</var>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①③">TypeError</a></code>.</p>
         <li data-md>
          <p>If <var>image</var>’s media data has no <a data-link-type="dfn" href="https://www.w3.org/TR/css-images-3/#natural-dimensions" id="ref-for-natural-dimensions">natural dimensions</a> (e.g., it’s a vector graphic with no specified content size), then
 throw an <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#invalidstateerror" id="ref-for-invalidstateerror①⑨">InvalidStateError</a></code> <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-DOMException" id="ref-for-idl-DOMException⑨">DOMException</a></code>.</p>
@@ -2841,7 +2900,7 @@ <h4 class="heading settled" data-level="9.4.2" id="videoframe-constructors"><spa
        <p><code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/canvas.html#offscreencanvas" id="ref-for-offscreencanvas">OffscreenCanvas</a></code></p>
        <ol>
         <li data-md>
-         <p>If <code class="idl"><a data-link-type="idl" href="#dom-videoframeinit-timestamp" id="ref-for-dom-videoframeinit-timestamp②">timestamp</a></code> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists②">exist</a> in <var>init</var>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①②">TypeError</a></code>.</p>
+         <p>If <code class="idl"><a data-link-type="idl" href="#dom-videoframeinit-timestamp" id="ref-for-dom-videoframeinit-timestamp②">timestamp</a></code> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists②">exist</a> in <var>init</var>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①④">TypeError</a></code>.</p>
         <li data-md>
          <p>Let <var>resource</var> be a new <a data-link-type="dfn" href="#media-resource" id="ref-for-media-resource①⑦">media resource</a> containing a copy of <var>image</var>’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#concept-imagebitmap-bitmap-data" id="ref-for-concept-imagebitmap-bitmap-data①">bitmap data</a>.</p>
          <p class="note" role="note"><span>NOTE:</span> Implementers are should avoid a deep copy by using reference
@@ -2865,9 +2924,9 @@ <h4 class="heading settled" data-level="9.4.2" id="videoframe-constructors"><spa
    <p><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="constructor" data-export data-lt="VideoFrame(planes, init)|constructor(planes, init)" id="dom-videoframe-videoframe-planes-init" title="VideoFrame(planes, init)"><code> VideoFrame(planes, init) </code></dfn></p>
    <ol>
     <li data-md>
-     <p>If <var>init</var> is not a <a data-link-type="dfn" href="#valid-videoframeplaneinit" id="ref-for-valid-videoframeplaneinit">valid VideoFramePlaneInit</a>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①③">TypeError</a></code>.</p>
+     <p>If <var>init</var> is not a <a data-link-type="dfn" href="#valid-videoframeplaneinit" id="ref-for-valid-videoframeplaneinit">valid VideoFramePlaneInit</a>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑤">TypeError</a></code>.</p>
     <li data-md>
-     <p>If <var>planes</var> is incompatible with the given <code class="idl"><a data-link-type="idl" href="#dom-videoframeplaneinit-format" id="ref-for-dom-videoframeplaneinit-format">format</a></code> (e.g. wrong number of planes), throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①④">TypeError</a></code>.</p>
+     <p>If <var>planes</var> is incompatible with the given <code class="idl"><a data-link-type="idl" href="#dom-videoframeplaneinit-format" id="ref-for-dom-videoframeplaneinit-format">format</a></code> (e.g. wrong number of planes), throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑥">TypeError</a></code>.</p>
      <p class="issue" id="issue-6bd004c9"><a class="self-link" href="#issue-6bd004c9"></a> The spec should list additional format specific validation steps (
     e.g. number and order of planes, acceptable sizing, etc...).  See <a href="https://github.com/w3c/webcodecs/issues/165">#165</a>.</p>
     <li data-md>
@@ -2956,40 +3015,40 @@ <h4 class="heading settled" data-level="9.4.3" id="videoframe-attributes"><span
      <p>Holds pixel data data, laid out as described by format and Plane
 attributes.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-planes" id="ref-for-dom-videoframe-planes①">planes</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-planes-slot" id="ref-for-dom-videoframe-planes-slot②">[[planes]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-codedwidth"><code>codedWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑦">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-codedwidth"><code>codedWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥①">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>Width of the <code class="idl"><a data-link-type="idl" href="#videoframe" id="ref-for-videoframe③①">VideoFrame</a></code> in pixels, prior to any cropping or aspect ratio
 adjustments.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-codedwidth" id="ref-for-dom-videoframe-codedwidth②">codedWidth</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-coded-width-slot" id="ref-for-dom-videoframe-coded-width-slot②">[[coded width]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-codedheight"><code>codedHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑧">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-codedheight"><code>codedHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥②">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>Height of the VideoFrame in pixels, prior to any cropping or aspect ratio
 adjustments.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-codedheight" id="ref-for-dom-videoframe-codedheight②">codedHeight</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-coded-height-slot" id="ref-for-dom-videoframe-coded-height-slot②">[[coded height]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-cropleft"><code>cropLeft</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤⑨">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-cropleft"><code>cropLeft</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥③">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The number of pixels to remove from the left of the VideoFrame, prior to
 aspect ratio adjustments.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-cropleft" id="ref-for-dom-videoframe-cropleft②">cropLeft</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-crop-left-slot" id="ref-for-dom-videoframe-crop-left-slot①">[[crop left]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-croptop"><code>cropTop</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⓪">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-croptop"><code>cropTop</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥④">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The number of pixels to remove from the top of the VideoFrame, prior to
 aspect ratio adjustments.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-croptop" id="ref-for-dom-videoframe-croptop②">cropTop</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-crop-top-slot" id="ref-for-dom-videoframe-crop-top-slot①">[[crop top]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-cropwidth"><code>cropWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥①">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-cropwidth"><code>cropWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑤">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The width of pixels to include in the crop, starting from cropLeft.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-cropwidth" id="ref-for-dom-videoframe-cropwidth①">cropWidth</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-crop-width-slot" id="ref-for-dom-videoframe-crop-width-slot④">[[crop width]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-cropheight"><code>cropHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥②">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-cropheight"><code>cropHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑥">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The height of pixels to include in the crop, starting from cropLeft.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-cropheight" id="ref-for-dom-videoframe-cropheight①">cropHeight</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-crop-height-slot" id="ref-for-dom-videoframe-crop-height-slot④">[[crop height]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-displaywidth"><code>displayWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥③">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-displaywidth"><code>displayWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑦">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>Width of the VideoFrame when displayed after applying aspect ratio
 adjustments.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-videoframe-displaywidth" id="ref-for-dom-videoframe-displaywidth①">displayWidth</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-videoframe-display-width-slot" id="ref-for-dom-videoframe-display-width-slot②">[[display width]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-displayheight"><code>displayHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥④">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="VideoFrame" data-dfn-type="attribute" data-export id="dom-videoframe-displayheight"><code>displayHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑧">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>Height of the VideoFrame when displayed after applying aspect ratio
 adjustments.</p>
@@ -3165,17 +3224,17 @@ <h3 class="heading settled" data-level="9.5" id="plane-interface"><span class="s
     it possible to efficiently add an alpha plane to an existing <code class="idl"><a data-link-type="idl" href="#videoframe" id="ref-for-videoframe③⑧">VideoFrame</a></code>.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://heycam.github.io/webidl/#Exposed" id="ref-for-Exposed⑧"><c- g>Exposed</c-></a>=(<c- n>Window</c->,<c- n>DedicatedWorker</c->)]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="plane"><code><c- g>Plane</c-></code></dfn> {
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-plane-stride" id="ref-for-dom-plane-stride⑥"><c- g>stride</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-plane-rows" id="ref-for-dom-plane-rows⑤"><c- g>rows</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑦"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-plane-length" id="ref-for-dom-plane-length④"><c- g>length</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-plane-stride" id="ref-for-dom-plane-stride⑥"><c- g>stride</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⓪"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-plane-rows" id="ref-for-dom-plane-rows⑤"><c- g>rows</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦①"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-plane-length" id="ref-for-dom-plane-length④"><c- g>length</c-></a>;
 
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑧"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-plane-readinto" id="ref-for-dom-plane-readinto"><c- g>readInto</c-></a>(<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#ArrayBufferView" id="ref-for-ArrayBufferView"><c- n>ArrayBufferView</c-></a> <dfn class="idl-code" data-dfn-for="Plane/readInto(dst)" data-dfn-type="argument" data-export id="dom-plane-readinto-dst-dst"><code><c- g>dst</c-></code><a class="self-link" href="#dom-plane-readinto-dst-dst"></a></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③⓪"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-plane-readinto" id="ref-for-dom-plane-readinto"><c- g>readInto</c-></a>(<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#ArrayBufferView" id="ref-for-ArrayBufferView②"><c- n>ArrayBufferView</c-></a> <dfn class="idl-code" data-dfn-for="Plane/readInto(dst)" data-dfn-type="argument" data-export id="dom-plane-readinto-dst-dst"><code><c- g>dst</c-></code><a class="self-link" href="#dom-plane-readinto-dst-dst"></a></dfn>);
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-planeinit"><code><c- g>PlaneInit</c-></code></dfn> {
   <c- b>required</c-> <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#BufferSource" id="ref-for-BufferSource⑧"><c- n>BufferSource</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PlaneInit" data-dfn-type="dict-member" data-export data-type="BufferSource " id="dom-planeinit-src"><code><c- g>src</c-></code></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑧"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="PlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-planeinit-stride"><code><c- g>stride</c-></code><a class="self-link" href="#dom-planeinit-stride"></a></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-planeinit-rows"><code><c- g>rows</c-></code></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦②"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="PlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-planeinit-stride"><code><c- g>stride</c-></code><a class="self-link" href="#dom-planeinit-stride"></a></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦③"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PlaneInit" data-dfn-type="dict-member" data-export data-type="unsigned long " id="dom-planeinit-rows"><code><c- g>rows</c-></code></dfn>;
 };
 </pre>
    <h4 class="heading settled" data-level="9.5.1" id="plane-internal-slots"><span class="secno">9.5.1. </span><span class="content">Internal Slots</span><a class="self-link" href="#plane-internal-slots"></a></h4>
@@ -3185,11 +3244,11 @@ <h4 class="heading settled" data-level="9.5.1" id="plane-internal-slots"><span c
    </dl>
    <h4 class="heading settled" data-level="9.5.2" id="plane-attributes"><span class="secno">9.5.2. </span><span class="content">Attributes</span><a class="self-link" href="#plane-attributes"></a></h4>
    <dl>
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="Plane" data-dfn-type="attribute" data-export id="dom-plane-stride"><code>stride</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⓪">unsigned long</a>, readonly</span>
+    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="Plane" data-dfn-type="attribute" data-export id="dom-plane-stride"><code>stride</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦④">unsigned long</a>, readonly</span>
     <dd>The width of each row including any padding.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="Plane" data-dfn-type="attribute" data-export id="dom-plane-rows"><code>rows</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦①">unsigned long</a>, readonly</span>
+    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="Plane" data-dfn-type="attribute" data-export id="dom-plane-rows"><code>rows</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑤">unsigned long</a>, readonly</span>
     <dd>The number of rows.
-    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="Plane" data-dfn-type="attribute" data-export id="dom-plane-length"><code>length</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦②">unsigned long</a>, readonly</span>
+    <dt><dfn class="dfn-paneled idl-code" data-dfn-for="Plane" data-dfn-type="attribute" data-export id="dom-plane-length"><code>length</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑥">unsigned long</a>, readonly</span>
     <dd>The total byte length of the plane (stride * rows).
    </dl>
    <h4 class="heading settled" data-level="9.5.3" id="plane-methods"><span class="secno">9.5.3. </span><span class="content">Methods</span><a class="self-link" href="#plane-methods"></a></h4>
@@ -3200,7 +3259,7 @@ <h4 class="heading settled" data-level="9.5.3" id="plane-methods"><span class="s
     <li data-md>
      <p>If <code class="idl"><a data-link-type="idl" href="#dom-plane-parent-frame-slot" id="ref-for-dom-plane-parent-frame-slot③">[[parent frame]]</a></code> has been destroyed, throw an <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#invalidstateerror" id="ref-for-invalidstateerror②②">InvalidStateError</a></code>.</p>
     <li data-md>
-     <p>If <code class="idl"><a data-link-type="idl" href="#dom-plane-length" id="ref-for-dom-plane-length⑤">length</a></code> is greater than |<code>dst.byteLength</code>|, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑤">TypeError</a></code>.</p>
+     <p>If <code class="idl"><a data-link-type="idl" href="#dom-plane-length" id="ref-for-dom-plane-length⑤">length</a></code> is greater than |<code>dst.byteLength</code>|, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑦">TypeError</a></code>.</p>
     <li data-md>
      <p>Let <var>resource</var> be the <a data-link-type="dfn" href="#media-resource" id="ref-for-media-resource②③">media resource</a> refrenced by <code class="idl"><a data-link-type="idl" href="#dom-plane-parent-frame-slot" id="ref-for-dom-plane-parent-frame-slot④">[[parent frame]]</a></code>'s <code class="idl"><a data-link-type="idl" href="#dom-videoframe-resource-reference-slot" id="ref-for-dom-videoframe-resource-reference-slot⑧">[[resource reference]]</a></code>.</p>
     <li data-md>
@@ -3237,12 +3296,12 @@ <h3 class="heading settled" data-level="10.2" id="imagedecoder-interface"><span
   <a class="idl-code" data-link-type="constructor" href="#dom-imagedecoder-imagedecoder" id="ref-for-dom-imagedecoder-imagedecoder"><c- g>constructor</c-></a>(<a data-link-type="idl-name" href="#dictdef-imagedecoderinit" id="ref-for-dictdef-imagedecoderinit"><c- n>ImageDecoderInit</c-></a> <dfn class="idl-code" data-dfn-for="ImageDecoder/ImageDecoder(init), ImageDecoder/constructor(init)" data-dfn-type="argument" data-export id="dom-imagedecoder-imagedecoder-init-init"><code><c- g>init</c-></code><a class="self-link" href="#dom-imagedecoder-imagedecoder-init-init"></a></dfn>);
 
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean①①"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="boolean" href="#dom-imagedecoder-complete" id="ref-for-dom-imagedecoder-complete"><c- g>complete</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise⑧"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined②⑨"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="Promise<undefined>" href="#dom-imagedecoder-completed" id="ref-for-dom-imagedecoder-completed"><c- g>completed</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise⑧"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③①"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="Promise<undefined>" href="#dom-imagedecoder-completed" id="ref-for-dom-imagedecoder-completed"><c- g>completed</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#imagetracklist" id="ref-for-imagetracklist"><c- n>ImageTrackList</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ImageTrackList" href="#dom-imagedecoder-tracks" id="ref-for-dom-imagedecoder-tracks"><c- g>tracks</c-></a>;
 
   <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise⑨"><c- b>Promise</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-imagedecoderesult" id="ref-for-dictdef-imagedecoderesult"><c- n>ImageDecodeResult</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-imagedecoder-decode" id="ref-for-dom-imagedecoder-decode"><c- g>decode</c-></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-imagedecodeoptions" id="ref-for-dictdef-imagedecodeoptions"><c- n>ImageDecodeOptions</c-></a> <dfn class="idl-code" data-dfn-for="ImageDecoder/decode(options), ImageDecoder/decode()" data-dfn-type="argument" data-export id="dom-imagedecoder-decode-options-options"><code><c- g>options</c-></code><a class="self-link" href="#dom-imagedecoder-decode-options-options"></a></dfn> = {});
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③⓪"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-imagedecoder-reset" id="ref-for-dom-imagedecoder-reset"><c- g>reset</c-></a>();
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③①"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-imagedecoder-close" id="ref-for-dom-imagedecoder-close"><c- g>close</c-></a>();
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③②"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-imagedecoder-reset" id="ref-for-dom-imagedecoder-reset"><c- g>reset</c-></a>();
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③③"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-imagedecoder-close" id="ref-for-dom-imagedecoder-close"><c- g>close</c-></a>();
 
   <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise①⓪"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean①②"><c- b>boolean</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-imagedecoder-istypesupported" id="ref-for-dom-imagedecoder-istypesupported"><c- g>isTypeSupported</c-></a>(<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-DOMString" id="ref-for-idl-DOMString⑧"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="ImageDecoder/isTypeSupported(type)" data-dfn-type="argument" data-export id="dom-imagedecoder-istypesupported-type-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-imagedecoder-istypesupported-type-type"></a></dfn>);
 };
@@ -3298,7 +3357,7 @@ <h4 class="heading settled" data-level="10.2.2" id="imagedecoder-constructor"><s
      <p>When invoked, run these steps:</p>
      <ol>
       <li data-md>
-       <p>If <var>init</var> is not <a data-link-type="dfn" href="#valid-imagedecoderinit" id="ref-for-valid-imagedecoderinit">valid ImageDecoderInit</a>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑥">TypeError</a></code>.</p>
+       <p>If <var>init</var> is not <a data-link-type="dfn" href="#valid-imagedecoderinit" id="ref-for-valid-imagedecoderinit">valid ImageDecoderInit</a>, throw a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑧">TypeError</a></code>.</p>
       <li data-md>
        <p>Let <var>d</var> be a new <code class="idl"><a data-link-type="idl" href="#imagedecoder" id="ref-for-imagedecoder④">ImageDecoder</a></code> object. In the steps below, all
 mentions of <code class="idl"><a data-link-type="idl" href="#imagedecoder" id="ref-for-imagedecoder⑤">ImageDecoder</a></code> members apply to <var>d</var> unless stated
@@ -3390,7 +3449,7 @@ <h4 class="heading settled" data-level="10.2.3" id="imagedecoder-attributes"><sp
     <dd data-md>
      <p>Indicates whether <code class="idl"><a data-link-type="idl" href="#dom-imagedecoder-encoded-data-slot" id="ref-for-dom-imagedecoder-encoded-data-slot⑤">[[encoded data]]</a></code> is completely buffered.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-imagedecoder-complete" id="ref-for-dom-imagedecoder-complete③">complete</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-imagedecoder-complete-slot" id="ref-for-dom-imagedecoder-complete-slot①">[[complete]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecoder" data-dfn-type="attribute" data-export id="dom-imagedecoder-completed"><code>completed</code></dfn>, <span> of type Promise&lt;<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③②">undefined</a>>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecoder" data-dfn-type="attribute" data-export id="dom-imagedecoder-completed"><code>completed</code></dfn>, <span> of type Promise&lt;<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③④">undefined</a>>, readonly</span>
     <dd data-md>
      <p>The promise used to signal when <code class="idl"><a data-link-type="idl" href="#dom-imagedecoder-complete" id="ref-for-dom-imagedecoder-complete④">complete</a></code> becomes <code>true</code>.</p>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-imagedecoder-completed" id="ref-for-dom-imagedecoder-completed①">completed</a></code> getter steps are to return <code class="idl"><a data-link-type="idl" href="#dom-imagedecoder-completed-promise-slot" id="ref-for-dom-imagedecoder-completed-promise-slot①">[[completed promise]]</a></code>.</p>
@@ -3452,7 +3511,7 @@ <h4 class="heading settled" data-level="10.2.4" id="imagedecoder-methods"><span
      <p>When invoked, run these steps:</p>
      <ol>
       <li data-md>
-       <p>If <var>type</var> is not a <a data-link-type="dfn" href="#valid-image-mime-type" id="ref-for-valid-image-mime-type">valid image MIME type</a>, return a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise①④">Promise</a></code> rejected with <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑦">TypeError</a></code>.</p>
+       <p>If <var>type</var> is not a <a data-link-type="dfn" href="#valid-image-mime-type" id="ref-for-valid-image-mime-type">valid image MIME type</a>, return a <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise①④">Promise</a></code> rejected with <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①⑨">TypeError</a></code>.</p>
       <li data-md>
        <p>Let <var>p</var> be a new <code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise①⑤">Promise</a></code>.</p>
       <li data-md>
@@ -3605,8 +3664,8 @@ <h4 class="heading settled" data-level="10.2.5" id="imagedecoder-algorithms"><sp
      </ol>
     <dt data-md><dfn class="dfn-paneled" data-dfn-for="ImageDecoder" data-dfn-type="dfn" data-noexport id="imagedecoder-update-tracks">Update Tracks</dfn>
     <dd data-md>
-     <p>A <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="track-update-struct">track update struct</dfn> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct" id="ref-for-struct">struct</a> that consists of a <dfn class="dfn-paneled" data-dfn-for="track update struct" data-dfn-type="dfn" data-noexport id="track-update-struct-track-index">track index</dfn> (<code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦③">unsigned long</a></code>)
-and a <dfn class="dfn-paneled" data-dfn-for="track update struct" data-dfn-type="dfn" data-noexport id="track-update-struct-frame-count">frame count</dfn> (<code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦④">unsigned long</a></code>).</p>
+     <p>A <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="track-update-struct">track update struct</dfn> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct" id="ref-for-struct">struct</a> that consists of a <dfn class="dfn-paneled" data-dfn-for="track update struct" data-dfn-type="dfn" data-noexport id="track-update-struct-track-index">track index</dfn> (<code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑦">unsigned long</a></code>)
+and a <dfn class="dfn-paneled" data-dfn-for="track update struct" data-dfn-type="dfn" data-noexport id="track-update-struct-frame-count">frame count</dfn> (<code class="idl"><a data-link-type="idl" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑧">unsigned long</a></code>).</p>
      <p>Run these steps:</p>
      <ol>
       <li data-md>
@@ -3876,8 +3935,8 @@ <h3 class="heading settled" data-level="10.3" id="imagedecoderinit-interface"><s
   <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-imagebuffersource" id="ref-for-typedefdef-imagebuffersource"><c- n>ImageBufferSource</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="ImageBufferSource " href="#dom-imagedecoderinit-data" id="ref-for-dom-imagedecoderinit-data③"><c- g>data</c-></a>;
   <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#premultiplyalpha" id="ref-for-premultiplyalpha"><c- n>PremultiplyAlpha</c-></a> <a class="idl-code" data-default="&quot;default&quot;" data-link-type="dict-member" data-type="PremultiplyAlpha " href="#dom-imagedecoderinit-premultiplyalpha" id="ref-for-dom-imagedecoderinit-premultiplyalpha①"><c- g>premultiplyAlpha</c-></a> = "default";
   <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#colorspaceconversion" id="ref-for-colorspaceconversion"><c- n>ColorSpaceConversion</c-></a> <a class="idl-code" data-default="&quot;default&quot;" data-link-type="dict-member" data-type="ColorSpaceConversion " href="#dom-imagedecoderinit-colorspaceconversion" id="ref-for-dom-imagedecoderinit-colorspaceconversion①"><c- g>colorSpaceConversion</c-></a> = "default";
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="unsigned long " href="#dom-imagedecoderinit-desiredwidth" id="ref-for-dom-imagedecoderinit-desiredwidth①"><c- g>desiredWidth</c-></a>;
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="unsigned long " href="#dom-imagedecoderinit-desiredheight" id="ref-for-dom-imagedecoderinit-desiredheight①"><c- g>desiredHeight</c-></a>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="unsigned long " href="#dom-imagedecoderinit-desiredwidth" id="ref-for-dom-imagedecoderinit-desiredwidth①"><c- g>desiredWidth</c-></a>;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⓪"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="unsigned long " href="#dom-imagedecoderinit-desiredheight" id="ref-for-dom-imagedecoderinit-desiredheight①"><c- g>desiredHeight</c-></a>;
   <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean①④"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-imagedecoderinit-preferanimation" id="ref-for-dom-imagedecoderinit-preferanimation①"><c- g>preferAnimation</c-></a>;
 };
 
@@ -3922,12 +3981,12 @@ <h3 class="heading settled" data-level="10.3" id="imagedecoderinit-interface"><s
     <dd data-md>
      <p>Controls whether decoded outputs' color space is converted or ignored, as
 defined by <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#dom-imagebitmapoptions-colorspaceconversion" id="ref-for-dom-imagebitmapoptions-colorspaceconversion">colorSpaceConversion</a></code> in <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#imagebitmapoptions" id="ref-for-imagebitmapoptions①">ImageBitmapOptions</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecoderInit" data-dfn-type="dict-member" data-export id="dom-imagedecoderinit-desiredwidth"><code>desiredWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑦">unsigned long</a></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecoderInit" data-dfn-type="dict-member" data-export id="dom-imagedecoderinit-desiredwidth"><code>desiredWidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧①">unsigned long</a></span>
     <dd data-md>
      <p>Indicates a desired width for decoded outputs. Implementation is best
 effort; decoding to a desired width may not be supported by all formats/
 decoders.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecoderInit" data-dfn-type="dict-member" data-export id="dom-imagedecoderinit-desiredheight"><code>desiredHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑧">unsigned long</a></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecoderInit" data-dfn-type="dict-member" data-export id="dom-imagedecoderinit-desiredheight"><code>desiredHeight</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧②">unsigned long</a></span>
     <dd data-md>
      <p>Indicates a desired height for decoded outputs. Implementation is best
 effort; decoding to a desired height may not be supported by all
@@ -3940,13 +3999,13 @@ <h3 class="heading settled" data-level="10.3" id="imagedecoderinit-interface"><s
    </dl>
    <h3 class="heading settled" data-level="10.4" id="imagedecodeoptions-interface"><span class="secno">10.4. </span><span class="content">ImageDecodeOptions Interface</span><a class="self-link" href="#imagedecodeoptions-interface"></a></h3>
 <pre class="idl highlight def"><c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-imagedecodeoptions"><code><c- g>ImageDecodeOptions</c-></code></dfn> {
-  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦⑨"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-default="0" data-link-type="dict-member" data-type="unsigned long " href="#dom-imagedecodeoptions-frameindex" id="ref-for-dom-imagedecodeoptions-frameindex②"><c- g>frameIndex</c-></a> = 0;
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧③"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-default="0" data-link-type="dict-member" data-type="unsigned long " href="#dom-imagedecodeoptions-frameindex" id="ref-for-dom-imagedecodeoptions-frameindex②"><c- g>frameIndex</c-></a> = 0;
   <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean①⑥"><c- b>boolean</c-></a> <a class="idl-code" data-default="true" data-link-type="dict-member" data-type="boolean " href="#dom-imagedecodeoptions-completeframesonly" id="ref-for-dom-imagedecodeoptions-completeframesonly①"><c- g>completeFramesOnly</c-></a> = <c- b>true</c->;
 };
 
 </pre>
    <dl>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecodeOptions" data-dfn-type="dict-member" data-export id="dom-imagedecodeoptions-frameindex"><code>frameIndex</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⓪">unsigned long</a>, defaulting to <code>0</code></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecodeOptions" data-dfn-type="dict-member" data-export id="dom-imagedecodeoptions-frameindex"><code>frameIndex</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧④">unsigned long</a>, defaulting to <code>0</code></span>
     <dd data-md>
      <p>The index of the frame to decode.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageDecodeOptions" data-dfn-type="dict-member" data-export id="dom-imagedecodeoptions-completeframesonly"><code>completeFramesOnly</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean①⑦">boolean</a>, defaulting to <code>true</code></span>
@@ -3987,10 +4046,10 @@ <h3 class="heading settled" data-level="10.5" id="imagedecoderesult-interface"><
    <h3 class="heading settled" data-level="10.6" id="imagetracklist-interface"><span class="secno">10.6. </span><span class="content">ImageTrackList Interface</span><a class="self-link" href="#imagetracklist-interface"></a></h3>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://heycam.github.io/webidl/#Exposed" id="ref-for-Exposed①⓪"><c- g>Exposed</c-></a>=(<c- n>Window</c->,<c- n>DedicatedWorker</c->)]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="imagetracklist"><code><c- g>ImageTrackList</c-></code></dfn> {
-  <c- b>getter</c-> <a data-link-type="idl-name" href="#imagetrack" id="ref-for-imagetrack④"><c- n>ImageTrack</c-></a> (<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧①"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="ImageTrackList/__getter__(index)" data-dfn-type="argument" data-export id="dom-imagetracklist-__getter__-index-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-imagetracklist-__getter__-index-index"></a></dfn>);
+  <c- b>getter</c-> <a data-link-type="idl-name" href="#imagetrack" id="ref-for-imagetrack④"><c- n>ImageTrack</c-></a> (<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="ImageTrackList/__getter__(index)" data-dfn-type="argument" data-export id="dom-imagetracklist-__getter__-index-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-imagetracklist-__getter__-index-index"></a></dfn>);
 
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise①⑥"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③③"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="Promise<undefined>" href="#dom-imagetracklist-ready" id="ref-for-dom-imagetracklist-ready"><c- g>ready</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-imagetracklist-length" id="ref-for-dom-imagetracklist-length"><c- g>length</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-promise" id="ref-for-idl-promise①⑥"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③⑤"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="Promise<undefined>" href="#dom-imagetracklist-ready" id="ref-for-dom-imagetracklist-ready"><c- g>ready</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-imagetracklist-length" id="ref-for-dom-imagetracklist-length"><c- g>length</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-long" id="ref-for-idl-long⑧"><c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="long" href="#dom-imagetracklist-selectedindex" id="ref-for-dom-imagetracklist-selectedindex"><c- g>selectedIndex</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#imagetrack" id="ref-for-imagetrack⑤"><c- n>ImageTrack</c-></a>? <a class="idl-code" data-link-type="attribute" data-readonly data-type="ImageTrack?" href="#dom-imagetracklist-selectedtrack" id="ref-for-dom-imagetracklist-selectedtrack"><c- g>selectedTrack</c-></a>;
 };
@@ -4014,10 +4073,10 @@ <h4 class="heading settled" data-level="10.6.1" id="imagetracklist-internal-slot
    </dl>
    <h4 class="heading settled" data-level="10.6.2" id="imagetracklist-attributes"><span class="secno">10.6.2. </span><span class="content">Attributes</span><a class="self-link" href="#imagetracklist-attributes"></a></h4>
    <dl>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrackList" data-dfn-type="attribute" data-export id="dom-imagetracklist-ready"><code>ready</code></dfn>, <span> of type Promise&lt;<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③④">undefined</a>>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrackList" data-dfn-type="attribute" data-export id="dom-imagetracklist-ready"><code>ready</code></dfn>, <span> of type Promise&lt;<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-undefined" id="ref-for-idl-undefined③⑥">undefined</a>>, readonly</span>
     <dd data-md>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-imagetracklist-ready" id="ref-for-dom-imagetracklist-ready①">ready</a></code> getter steps are to return the <code class="idl"><a data-link-type="idl" href="#dom-imagetracklist-ready-promise-slot" id="ref-for-dom-imagetracklist-ready-promise-slot①">[[ready promise]]</a></code>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrackList" data-dfn-type="attribute" data-export id="dom-imagetracklist-length"><code>length</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧③">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrackList" data-dfn-type="attribute" data-export id="dom-imagetracklist-length"><code>length</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⑦">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-imagetracklist-length" id="ref-for-dom-imagetracklist-length①">length</a></code> getter steps are to return the length of <code class="idl"><a data-link-type="idl" href="#dom-imagetracklist-track-list-slot" id="ref-for-dom-imagetracklist-track-list-slot⑤">[[track list]]</a></code>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrackList" data-dfn-type="attribute" data-export id="dom-imagetracklist-selectedindex"><code>selectedIndex</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-long" id="ref-for-idl-long⑨">long</a>, readonly</span>
@@ -4037,7 +4096,7 @@ <h3 class="heading settled" data-level="10.7" id="imagetrack-interface"><span cl
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://heycam.github.io/webidl/#Exposed" id="ref-for-Exposed①①"><c- g>Exposed</c-></a>=(<c- n>Window</c->,<c- n>DedicatedWorker</c->)]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="imagetrack"><code><c- g>ImageTrack</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#eventtarget" id="ref-for-eventtarget"><c- n>EventTarget</c-></a> {
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean②⓪"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="boolean" href="#dom-imagetrack-animated" id="ref-for-dom-imagetrack-animated②"><c- g>animated</c-></a>;
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧④"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-imagetrack-framecount" id="ref-for-dom-imagetrack-framecount②"><c- g>frameCount</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⑧"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-imagetrack-framecount" id="ref-for-dom-imagetrack-framecount②"><c- g>frameCount</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unrestricted-float" id="ref-for-idl-unrestricted-float"><c- b>unrestricted</c-> <c- b>float</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unrestricted float" href="#dom-imagetrack-repetitioncount" id="ref-for-dom-imagetrack-repetitioncount"><c- g>repetitionCount</c-></a>;
   <c- b>attribute</c-> <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler"><c- n>EventHandler</c-></a> <a class="idl-code" data-link-type="attribute" data-type="EventHandler" href="#dom-imagetrack-onchange" id="ref-for-dom-imagetrack-onchange"><c- g>onchange</c-></a>;
   <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-boolean" id="ref-for-idl-boolean②①"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="attribute" data-type="boolean" href="#dom-imagetrack-selected" id="ref-for-dom-imagetrack-selected"><c- g>selected</c-></a>;
@@ -4073,7 +4132,7 @@ <h4 class="heading settled" data-level="10.7.2" id="imagetrack-attributes"><span
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-imagetrack-animated" id="ref-for-dom-imagetrack-animated③">animated</a></code> getter steps are to return the value of <code class="idl"><a data-link-type="idl" href="#dom-imagetrack-animated-slot" id="ref-for-dom-imagetrack-animated-slot①">[[animated]]</a></code>.</p>
      <p class="note" role="note"><span>NOTE:</span> This attribute provides an early indication that <code class="idl"><a data-link-type="idl" href="#dom-imagetrack-framecount" id="ref-for-dom-imagetrack-framecount③">frameCount</a></code> will ultimately exceed 0 for images where the <code class="idl"><a data-link-type="idl" href="#dom-imagetrack-framecount" id="ref-for-dom-imagetrack-framecount④">frameCount</a></code> starts at <code>0</code> and later increments as new
     chunks of the <code class="idl"><a data-link-type="idl" href="https://streams.spec.whatwg.org/#readablestream" id="ref-for-readablestream⑥">ReadableStream</a></code> <code class="idl"><a data-link-type="idl" href="#dom-imagedecoderinit-data" id="ref-for-dom-imagedecoderinit-data⑤">data</a></code> arrive.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrack" data-dfn-type="attribute" data-export id="dom-imagetrack-framecount"><code>frameCount</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⑤">unsigned long</a>, readonly</span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrack" data-dfn-type="attribute" data-export id="dom-imagetrack-framecount"><code>frameCount</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧⑨">unsigned long</a>, readonly</span>
     <dd data-md>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-imagetrack-framecount" id="ref-for-dom-imagetrack-framecount⑤">frameCount</a></code> getter steps are to return the value of <code class="idl"><a data-link-type="idl" href="#dom-imagetrack-frame-count-slot" id="ref-for-dom-imagetrack-frame-count-slot②">[[frame count]]</a></code>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ImageTrack" data-dfn-type="attribute" data-export id="dom-imagetrack-repetitioncount"><code>repetitionCount</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://heycam.github.io/webidl/#idl-unrestricted-float" id="ref-for-idl-unrestricted-float①">unrestricted float</a>, readonly</span>
@@ -4158,8 +4217,6 @@ <h2 class="heading settled" data-level="11" id="security-considerations"><span c
 input or output while the underlying codec may still be operating on that data.
 This concern is mitigated by ensuring that input and output interfaces are
 immutable.</p>
-   <p class="issue" id="issue-fde64654"><a class="self-link" href="#issue-fde64654"></a> EncodedVideoChunk and EncodedAudioChunk currently expose a mutable
-data. See <a href="https://github.com/w3c/webcodecs/issues/80">#80</a>.</p>
    <h2 class="heading settled" data-level="12" id="privacy-considerations"><span class="secno">12. </span><span class="content">Privacy Considerations</span><a class="self-link" href="#privacy-considerations"></a></h2>
     The primary privacy impact is an increased ability to fingerprint users by
 querying for different codec capabilities to establish a codec feature profile.
@@ -4227,6 +4284,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-audioencoderconfig-bitrate">dict-member for AudioEncoderConfig</a><span>, in §7.7</span>
      <li><a href="#dom-videoencoderconfig-bitrate">dict-member for VideoEncoderConfig</a><span>, in §7.8</span>
     </ul>
+   <li>
+    byteLength
+    <ul>
+     <li><a href="#dom-encodedaudiochunk-bytelength">attribute for EncodedAudioChunk</a><span>, in §8.1.3</span>
+     <li><a href="#dom-encodedvideochunk-bytelength">attribute for EncodedVideoChunk</a><span>, in §8.2.3</span>
+    </ul>
    <li><a href="#eventdef-imagetrack-change">change</a><span>, in §10.7.3</span>
    <li><a href="#check-configuration-support">Check Configuration Support</a><span>, in §7.1</span>
    <li><a href="#imagedecoder-check-type-support">Check Type Support</a><span>, in §10.2.5</span>
@@ -4335,8 +4398,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-audiodata-audiodata">constructor for AudioData</a><span>, in §9.2.2</span>
      <li><a href="#dom-audiodecoder-audiodecoder">constructor for AudioDecoder</a><span>, in §3.2</span>
      <li><a href="#dom-audioencoder-audioencoder">constructor for AudioEncoder</a><span>, in §5.2</span>
-     <li><a href="#dom-encodedaudiochunk-encodedaudiochunk">constructor for EncodedAudioChunk</a><span>, in §8.1.1</span>
-     <li><a href="#dom-encodedvideochunk-encodedvideochunk">constructor for EncodedVideoChunk</a><span>, in §8.2.1</span>
+     <li><a href="#dom-encodedaudiochunk-encodedaudiochunk">constructor for EncodedAudioChunk</a><span>, in §8.1.2</span>
+     <li><a href="#dom-encodedvideochunk-encodedvideochunk">constructor for EncodedVideoChunk</a><span>, in §8.2.2</span>
      <li><a href="#dom-imagedecoder-imagedecoder">constructor for ImageDecoder</a><span>, in §10.2.2</span>
      <li><a href="#dom-videodecoder-videodecoder">constructor for VideoDecoder</a><span>, in §4.2</span>
      <li><a href="#dom-videoencoder-videoencoder">constructor for VideoEncoder</a><span>, in §6.2</span>
@@ -4347,6 +4410,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#running-a-control-message">control message steps</a><span>, in §2.2</span>
    <li><a href="#control-thread">control thread</a><span>, in §2.2</span>
    <li><a href="#dom-audiodata-copyto">copyTo(destination, planeNumber)</a><span>, in §9.2.4</span>
+   <li>
+    copyTo(dst)
+    <ul>
+     <li><a href="#dom-encodedaudiochunk-copyto">method for EncodedAudioChunk</a><span>, in §8.1.4</span>
+     <li><a href="#dom-encodedvideochunk-copyto">method for EncodedVideoChunk</a><span>, in §8.2.4</span>
+    </ul>
    <li><a href="#create-a-videoframe">Create a VideoFrame</a><span>, in §4.5</span>
    <li><a href="#dom-videoframe-crop-height-slot">[[crop height]]</a><span>, in §9.4.1</span>
    <li>
@@ -4383,8 +4452,6 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li>
     data
     <ul>
-     <li><a href="#dom-encodedaudiochunk-data">attribute for EncodedAudioChunk</a><span>, in §8.1.2</span>
-     <li><a href="#dom-encodedvideochunk-data">attribute for EncodedVideoChunk</a><span>, in §8.2.2</span>
      <li><a href="#dom-audiodatainit-data">dict-member for AudioDataInit</a><span>, in §9.2</span>
      <li><a href="#dom-encodedaudiochunkinit-data">dict-member for EncodedAudioChunkInit</a><span>, in §8.1</span>
      <li><a href="#dom-encodedvideochunkinit-data">dict-member for EncodedVideoChunkInit</a><span>, in §8.2</span>
@@ -4452,7 +4519,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     duration
     <ul>
      <li><a href="#dom-audiodata-duration">attribute for AudioData</a><span>, in §9.2.3</span>
-     <li><a href="#dom-encodedvideochunk-duration">attribute for EncodedVideoChunk</a><span>, in §8.2.2</span>
+     <li><a href="#dom-encodedvideochunk-duration">attribute for EncodedVideoChunk</a><span>, in §8.2.3</span>
      <li><a href="#dom-videoframe-duration">attribute for VideoFrame</a><span>, in §9.4.3</span>
      <li><a href="#dom-encodedvideochunkinit-duration">dict-member for EncodedVideoChunkInit</a><span>, in §8.2</span>
      <li><a href="#dom-videoframeinit-duration">dict-member for VideoFrameInit</a><span>, in §9.4</span>
@@ -4460,13 +4527,13 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     </ul>
    <li><a href="#dom-audioencoder-encode">encode(data)</a><span>, in §5.4</span>
    <li><a href="#encodedaudiochunk">EncodedAudioChunk</a><span>, in §8.1</span>
-   <li><a href="#dom-encodedaudiochunk-encodedaudiochunk">EncodedAudioChunk(init)</a><span>, in §8.1.1</span>
+   <li><a href="#dom-encodedaudiochunk-encodedaudiochunk">EncodedAudioChunk(init)</a><span>, in §8.1.2</span>
    <li><a href="#dictdef-encodedaudiochunkinit">EncodedAudioChunkInit</a><span>, in §8.1</span>
    <li><a href="#callbackdef-encodedaudiochunkoutputcallback">EncodedAudioChunkOutputCallback</a><span>, in §5</span>
    <li><a href="#enumdef-encodedaudiochunktype">EncodedAudioChunkType</a><span>, in §8.1</span>
    <li><a href="#dom-imagedecoder-encoded-data-slot">[[encoded data]]</a><span>, in §10.2.1</span>
    <li><a href="#encodedvideochunk">EncodedVideoChunk</a><span>, in §8.2</span>
-   <li><a href="#dom-encodedvideochunk-encodedvideochunk">EncodedVideoChunk(init)</a><span>, in §8.2.1</span>
+   <li><a href="#dom-encodedvideochunk-encodedvideochunk">EncodedVideoChunk(init)</a><span>, in §8.2.2</span>
    <li><a href="#dictdef-encodedvideochunkinit">EncodedVideoChunkInit</a><span>, in §8.2</span>
    <li><a href="#callbackdef-encodedvideochunkoutputcallback">EncodedVideoChunkOutputCallback</a><span>, in §6</span>
    <li><a href="#enumdef-encodedvideochunktype">EncodedVideoChunkType</a><span>, in §8.2</span>
@@ -4552,6 +4619,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#videoframe-initialize-frame-from-other-frame">Initialize Frame From Other Frame</a><span>, in §9.4.5</span>
    <li><a href="#videoframe-initialize-frame-with-resource-and-size">Initialize Frame With Resource and Size</a><span>, in §9.4.5</span>
    <li><a href="#injected-state">injected state</a><span>, in §2.2</span>
+   <li>
+    [[internal data]]
+    <ul>
+     <li><a href="#dom-encodedaudiochunk-internal-data-slot">attribute for EncodedAudioChunk</a><span>, in §8.1.1</span>
+     <li><a href="#dom-encodedvideochunk-internal-data-slot">attribute for EncodedVideoChunk</a><span>, in §8.2.1</span>
+    </ul>
    <li><a href="#internal-pending-output">Internal Pending Output</a><span>, in §1</span>
    <li><a href="#dom-imagedecoder-internal-selected-track-index-slot">[[internal selected track index]]</a><span>, in §10.2.1</span>
    <li>
@@ -4729,8 +4802,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     timestamp
     <ul>
      <li><a href="#dom-audiodata-timestamp">attribute for AudioData</a><span>, in §9.2.3</span>
-     <li><a href="#dom-encodedaudiochunk-timestamp">attribute for EncodedAudioChunk</a><span>, in §8.1.2</span>
-     <li><a href="#dom-encodedvideochunk-timestamp">attribute for EncodedVideoChunk</a><span>, in §8.2.2</span>
+     <li><a href="#dom-encodedaudiochunk-timestamp">attribute for EncodedAudioChunk</a><span>, in §8.1.3</span>
+     <li><a href="#dom-encodedvideochunk-timestamp">attribute for EncodedVideoChunk</a><span>, in §8.2.3</span>
      <li><a href="#dom-videoframe-timestamp">attribute for VideoFrame</a><span>, in §9.4.3</span>
      <li><a href="#dom-audiodatainit-timestamp">dict-member for AudioDataInit</a><span>, in §9.2</span>
      <li><a href="#dom-encodedaudiochunkinit-timestamp">dict-member for EncodedAudioChunkInit</a><span>, in §8.1</span>
@@ -4746,8 +4819,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li>
     type
     <ul>
-     <li><a href="#dom-encodedaudiochunk-type">attribute for EncodedAudioChunk</a><span>, in §8.1.2</span>
-     <li><a href="#dom-encodedvideochunk-type">attribute for EncodedVideoChunk</a><span>, in §8.2.2</span>
+     <li><a href="#dom-encodedaudiochunk-type">attribute for EncodedAudioChunk</a><span>, in §8.1.3</span>
+     <li><a href="#dom-encodedvideochunk-type">attribute for EncodedVideoChunk</a><span>, in §8.2.3</span>
      <li><a href="#dom-encodedaudiochunkinit-type">dict-member for EncodedAudioChunkInit</a><span>, in §8.1</span>
      <li><a href="#dom-encodedvideochunkinit-type">dict-member for EncodedVideoChunkInit</a><span>, in §8.2</span>
      <li><a href="#dom-imagedecoderinit-type">dict-member for ImageDecoderInit</a><span>, in §10.3</span>
@@ -5166,19 +5239,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-AllowShared">9.2. AudioData Interface</a>
    </ul>
   </aside>
-  <aside class="dfn-panel" data-for="term-for-idl-ArrayBuffer">
-   <a href="https://heycam.github.io/webidl/#idl-ArrayBuffer">https://heycam.github.io/webidl/#idl-ArrayBuffer</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-idl-ArrayBuffer">8.1. EncodedAudioChunk Interface</a>
-    <li><a href="#ref-for-idl-ArrayBuffer①">8.1.2. Attributes</a>
-    <li><a href="#ref-for-idl-ArrayBuffer②">8.2. EncodedVideoChunk Interface</a>
-    <li><a href="#ref-for-idl-ArrayBuffer③">8.2.2. Attributes</a>
-   </ul>
-  </aside>
   <aside class="dfn-panel" data-for="term-for-ArrayBufferView">
    <a href="https://heycam.github.io/webidl/#ArrayBufferView">https://heycam.github.io/webidl/#ArrayBufferView</a><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-ArrayBufferView">9.5. Plane Interface</a>
+    <li><a href="#ref-for-ArrayBufferView">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-ArrayBufferView①">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-ArrayBufferView②">9.5. Plane Interface</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-BufferSource">
@@ -5326,11 +5392,13 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-exceptiondef-typeerror②">4.4. Methods</a> <a href="#ref-for-exceptiondef-typeerror③">(2)</a>
     <li><a href="#ref-for-exceptiondef-typeerror④">5.4. Methods</a> <a href="#ref-for-exceptiondef-typeerror⑤">(2)</a> <a href="#ref-for-exceptiondef-typeerror⑥">(3)</a>
     <li><a href="#ref-for-exceptiondef-typeerror⑦">6.4. Methods</a> <a href="#ref-for-exceptiondef-typeerror⑧">(2)</a> <a href="#ref-for-exceptiondef-typeerror⑨">(3)</a>
-    <li><a href="#ref-for-exceptiondef-typeerror①⓪">9.2.4. Methods</a>
-    <li><a href="#ref-for-exceptiondef-typeerror①①">9.4.2. Constructors</a> <a href="#ref-for-exceptiondef-typeerror①②">(2)</a> <a href="#ref-for-exceptiondef-typeerror①③">(3)</a> <a href="#ref-for-exceptiondef-typeerror①④">(4)</a>
-    <li><a href="#ref-for-exceptiondef-typeerror①⑤">9.5.3. Methods</a>
-    <li><a href="#ref-for-exceptiondef-typeerror①⑥">10.2.2. Constructor</a>
-    <li><a href="#ref-for-exceptiondef-typeerror①⑦">10.2.4. Methods</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①⓪">8.1.4. Methods</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①①">8.2.4. Methods</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①②">9.2.4. Methods</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①③">9.4.2. Constructors</a> <a href="#ref-for-exceptiondef-typeerror①④">(2)</a> <a href="#ref-for-exceptiondef-typeerror①⑤">(3)</a> <a href="#ref-for-exceptiondef-typeerror①⑥">(4)</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①⑦">9.5.3. Methods</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①⑧">10.2.2. Constructor</a>
+    <li><a href="#ref-for-exceptiondef-typeerror①⑨">10.2.4. Methods</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-a-promise-rejected-with">
@@ -5411,13 +5479,15 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-idl-undefined①②">5. AudioEncoder Interface</a> <a href="#ref-for-idl-undefined①③">(2)</a> <a href="#ref-for-idl-undefined①④">(3)</a> <a href="#ref-for-idl-undefined①⑤">(4)</a> <a href="#ref-for-idl-undefined①⑥">(5)</a> <a href="#ref-for-idl-undefined①⑦">(6)</a>
     <li><a href="#ref-for-idl-undefined①⑧">6. VideoEncoder Interface</a> <a href="#ref-for-idl-undefined①⑨">(2)</a> <a href="#ref-for-idl-undefined②⓪">(3)</a> <a href="#ref-for-idl-undefined②①">(4)</a> <a href="#ref-for-idl-undefined②②">(5)</a> <a href="#ref-for-idl-undefined②③">(6)</a>
     <li><a href="#ref-for-idl-undefined②④">7.13. WebCodecsErrorCallback</a>
-    <li><a href="#ref-for-idl-undefined②⑤">9.2. AudioData Interface</a> <a href="#ref-for-idl-undefined②⑥">(2)</a>
-    <li><a href="#ref-for-idl-undefined②⑦">9.4. VideoFrame Interface</a>
-    <li><a href="#ref-for-idl-undefined②⑧">9.5. Plane Interface</a>
-    <li><a href="#ref-for-idl-undefined②⑨">10.2. ImageDecoder Interface</a> <a href="#ref-for-idl-undefined③⓪">(2)</a> <a href="#ref-for-idl-undefined③①">(3)</a>
-    <li><a href="#ref-for-idl-undefined③②">10.2.3. Attributes</a>
-    <li><a href="#ref-for-idl-undefined③③">10.6. ImageTrackList Interface</a>
-    <li><a href="#ref-for-idl-undefined③④">10.6.2. Attributes</a>
+    <li><a href="#ref-for-idl-undefined②⑤">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-idl-undefined②⑥">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-idl-undefined②⑦">9.2. AudioData Interface</a> <a href="#ref-for-idl-undefined②⑧">(2)</a>
+    <li><a href="#ref-for-idl-undefined②⑨">9.4. VideoFrame Interface</a>
+    <li><a href="#ref-for-idl-undefined③⓪">9.5. Plane Interface</a>
+    <li><a href="#ref-for-idl-undefined③①">10.2. ImageDecoder Interface</a> <a href="#ref-for-idl-undefined③②">(2)</a> <a href="#ref-for-idl-undefined③③">(3)</a>
+    <li><a href="#ref-for-idl-undefined③④">10.2.3. Attributes</a>
+    <li><a href="#ref-for-idl-undefined③⑤">10.6. ImageTrackList Interface</a>
+    <li><a href="#ref-for-idl-undefined③⑥">10.6.2. Attributes</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-idl-unrestricted-float">
@@ -5434,19 +5504,23 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-idl-unsigned-long④">7.6. VideoDecoderConfig</a> <a href="#ref-for-idl-unsigned-long⑤">(2)</a> <a href="#ref-for-idl-unsigned-long⑥">(3)</a> <a href="#ref-for-idl-unsigned-long⑦">(4)</a> <a href="#ref-for-idl-unsigned-long⑧">(5)</a> <a href="#ref-for-idl-unsigned-long⑨">(6)</a> <a href="#ref-for-idl-unsigned-long①⓪">(7)</a> <a href="#ref-for-idl-unsigned-long①①">(8)</a> <a href="#ref-for-idl-unsigned-long①②">(9)</a> <a href="#ref-for-idl-unsigned-long①③">(10)</a> <a href="#ref-for-idl-unsigned-long①④">(11)</a> <a href="#ref-for-idl-unsigned-long①⑤">(12)</a> <a href="#ref-for-idl-unsigned-long①⑥">(13)</a> <a href="#ref-for-idl-unsigned-long①⑦">(14)</a> <a href="#ref-for-idl-unsigned-long①⑧">(15)</a> <a href="#ref-for-idl-unsigned-long①⑨">(16)</a>
     <li><a href="#ref-for-idl-unsigned-long②⓪">7.7. AudioEncoderConfig</a> <a href="#ref-for-idl-unsigned-long②①">(2)</a> <a href="#ref-for-idl-unsigned-long②②">(3)</a> <a href="#ref-for-idl-unsigned-long②③">(4)</a>
     <li><a href="#ref-for-idl-unsigned-long②④">7.8. VideoEncoderConfig</a> <a href="#ref-for-idl-unsigned-long②⑤">(2)</a> <a href="#ref-for-idl-unsigned-long②⑥">(3)</a> <a href="#ref-for-idl-unsigned-long②⑦">(4)</a> <a href="#ref-for-idl-unsigned-long②⑧">(5)</a> <a href="#ref-for-idl-unsigned-long②⑨">(6)</a> <a href="#ref-for-idl-unsigned-long③⓪">(7)</a> <a href="#ref-for-idl-unsigned-long③①">(8)</a>
-    <li><a href="#ref-for-idl-unsigned-long③②">9.2. AudioData Interface</a> <a href="#ref-for-idl-unsigned-long③③">(2)</a> <a href="#ref-for-idl-unsigned-long③④">(3)</a> <a href="#ref-for-idl-unsigned-long③⑤">(4)</a> <a href="#ref-for-idl-unsigned-long③⑥">(5)</a> <a href="#ref-for-idl-unsigned-long③⑦">(6)</a>
-    <li><a href="#ref-for-idl-unsigned-long③⑧">9.2.3. Attributes</a> <a href="#ref-for-idl-unsigned-long③⑨">(2)</a> <a href="#ref-for-idl-unsigned-long④⓪">(3)</a>
-    <li><a href="#ref-for-idl-unsigned-long④①">9.4. VideoFrame Interface</a> <a href="#ref-for-idl-unsigned-long④②">(2)</a> <a href="#ref-for-idl-unsigned-long④③">(3)</a> <a href="#ref-for-idl-unsigned-long④④">(4)</a> <a href="#ref-for-idl-unsigned-long④⑤">(5)</a> <a href="#ref-for-idl-unsigned-long④⑥">(6)</a> <a href="#ref-for-idl-unsigned-long④⑦">(7)</a> <a href="#ref-for-idl-unsigned-long④⑧">(8)</a> <a href="#ref-for-idl-unsigned-long④⑨">(9)</a> <a href="#ref-for-idl-unsigned-long⑤⓪">(10)</a> <a href="#ref-for-idl-unsigned-long⑤①">(11)</a> <a href="#ref-for-idl-unsigned-long⑤②">(12)</a> <a href="#ref-for-idl-unsigned-long⑤③">(13)</a> <a href="#ref-for-idl-unsigned-long⑤④">(14)</a> <a href="#ref-for-idl-unsigned-long⑤⑤">(15)</a> <a href="#ref-for-idl-unsigned-long⑤⑥">(16)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑤⑦">9.4.3. Attributes</a> <a href="#ref-for-idl-unsigned-long⑤⑧">(2)</a> <a href="#ref-for-idl-unsigned-long⑤⑨">(3)</a> <a href="#ref-for-idl-unsigned-long⑥⓪">(4)</a> <a href="#ref-for-idl-unsigned-long⑥①">(5)</a> <a href="#ref-for-idl-unsigned-long⑥②">(6)</a> <a href="#ref-for-idl-unsigned-long⑥③">(7)</a> <a href="#ref-for-idl-unsigned-long⑥④">(8)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑥⑤">9.5. Plane Interface</a> <a href="#ref-for-idl-unsigned-long⑥⑥">(2)</a> <a href="#ref-for-idl-unsigned-long⑥⑦">(3)</a> <a href="#ref-for-idl-unsigned-long⑥⑧">(4)</a> <a href="#ref-for-idl-unsigned-long⑥⑨">(5)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑦⓪">9.5.2. Attributes</a> <a href="#ref-for-idl-unsigned-long⑦①">(2)</a> <a href="#ref-for-idl-unsigned-long⑦②">(3)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑦③">10.2.5. Algorithms</a> <a href="#ref-for-idl-unsigned-long⑦④">(2)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑦⑤">10.3. ImageDecoderInit Interface</a> <a href="#ref-for-idl-unsigned-long⑦⑥">(2)</a> <a href="#ref-for-idl-unsigned-long⑦⑦">(3)</a> <a href="#ref-for-idl-unsigned-long⑦⑧">(4)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑦⑨">10.4. ImageDecodeOptions Interface</a> <a href="#ref-for-idl-unsigned-long⑧⓪">(2)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑧①">10.6. ImageTrackList Interface</a> <a href="#ref-for-idl-unsigned-long⑧②">(2)</a>
-    <li><a href="#ref-for-idl-unsigned-long⑧③">10.6.2. Attributes</a>
-    <li><a href="#ref-for-idl-unsigned-long⑧④">10.7. ImageTrack Interface</a>
-    <li><a href="#ref-for-idl-unsigned-long⑧⑤">10.7.2. Attributes</a>
+    <li><a href="#ref-for-idl-unsigned-long③②">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-idl-unsigned-long③③">8.1.3. Attributes</a>
+    <li><a href="#ref-for-idl-unsigned-long③④">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-idl-unsigned-long③⑤">8.2.3. Attributes</a>
+    <li><a href="#ref-for-idl-unsigned-long③⑥">9.2. AudioData Interface</a> <a href="#ref-for-idl-unsigned-long③⑦">(2)</a> <a href="#ref-for-idl-unsigned-long③⑧">(3)</a> <a href="#ref-for-idl-unsigned-long③⑨">(4)</a> <a href="#ref-for-idl-unsigned-long④⓪">(5)</a> <a href="#ref-for-idl-unsigned-long④①">(6)</a>
+    <li><a href="#ref-for-idl-unsigned-long④②">9.2.3. Attributes</a> <a href="#ref-for-idl-unsigned-long④③">(2)</a> <a href="#ref-for-idl-unsigned-long④④">(3)</a>
+    <li><a href="#ref-for-idl-unsigned-long④⑤">9.4. VideoFrame Interface</a> <a href="#ref-for-idl-unsigned-long④⑥">(2)</a> <a href="#ref-for-idl-unsigned-long④⑦">(3)</a> <a href="#ref-for-idl-unsigned-long④⑧">(4)</a> <a href="#ref-for-idl-unsigned-long④⑨">(5)</a> <a href="#ref-for-idl-unsigned-long⑤⓪">(6)</a> <a href="#ref-for-idl-unsigned-long⑤①">(7)</a> <a href="#ref-for-idl-unsigned-long⑤②">(8)</a> <a href="#ref-for-idl-unsigned-long⑤③">(9)</a> <a href="#ref-for-idl-unsigned-long⑤④">(10)</a> <a href="#ref-for-idl-unsigned-long⑤⑤">(11)</a> <a href="#ref-for-idl-unsigned-long⑤⑥">(12)</a> <a href="#ref-for-idl-unsigned-long⑤⑦">(13)</a> <a href="#ref-for-idl-unsigned-long⑤⑧">(14)</a> <a href="#ref-for-idl-unsigned-long⑤⑨">(15)</a> <a href="#ref-for-idl-unsigned-long⑥⓪">(16)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑥①">9.4.3. Attributes</a> <a href="#ref-for-idl-unsigned-long⑥②">(2)</a> <a href="#ref-for-idl-unsigned-long⑥③">(3)</a> <a href="#ref-for-idl-unsigned-long⑥④">(4)</a> <a href="#ref-for-idl-unsigned-long⑥⑤">(5)</a> <a href="#ref-for-idl-unsigned-long⑥⑥">(6)</a> <a href="#ref-for-idl-unsigned-long⑥⑦">(7)</a> <a href="#ref-for-idl-unsigned-long⑥⑧">(8)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑥⑨">9.5. Plane Interface</a> <a href="#ref-for-idl-unsigned-long⑦⓪">(2)</a> <a href="#ref-for-idl-unsigned-long⑦①">(3)</a> <a href="#ref-for-idl-unsigned-long⑦②">(4)</a> <a href="#ref-for-idl-unsigned-long⑦③">(5)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑦④">9.5.2. Attributes</a> <a href="#ref-for-idl-unsigned-long⑦⑤">(2)</a> <a href="#ref-for-idl-unsigned-long⑦⑥">(3)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑦⑦">10.2.5. Algorithms</a> <a href="#ref-for-idl-unsigned-long⑦⑧">(2)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑦⑨">10.3. ImageDecoderInit Interface</a> <a href="#ref-for-idl-unsigned-long⑧⓪">(2)</a> <a href="#ref-for-idl-unsigned-long⑧①">(3)</a> <a href="#ref-for-idl-unsigned-long⑧②">(4)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑧③">10.4. ImageDecodeOptions Interface</a> <a href="#ref-for-idl-unsigned-long⑧④">(2)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑧⑤">10.6. ImageTrackList Interface</a> <a href="#ref-for-idl-unsigned-long⑧⑥">(2)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑧⑦">10.6.2. Attributes</a>
+    <li><a href="#ref-for-idl-unsigned-long⑧⑧">10.7. ImageTrack Interface</a>
+    <li><a href="#ref-for-idl-unsigned-long⑧⑨">10.7.2. Attributes</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-idl-unsigned-long-long">
@@ -5455,9 +5529,9 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-idl-unsigned-long-long">7.7. AudioEncoderConfig</a> <a href="#ref-for-idl-unsigned-long-long①">(2)</a>
     <li><a href="#ref-for-idl-unsigned-long-long②">7.8. VideoEncoderConfig</a> <a href="#ref-for-idl-unsigned-long-long③">(2)</a>
     <li><a href="#ref-for-idl-unsigned-long-long④">8.1. EncodedAudioChunk Interface</a> <a href="#ref-for-idl-unsigned-long-long⑤">(2)</a>
-    <li><a href="#ref-for-idl-unsigned-long-long⑥">8.1.2. Attributes</a>
+    <li><a href="#ref-for-idl-unsigned-long-long⑥">8.1.3. Attributes</a>
     <li><a href="#ref-for-idl-unsigned-long-long⑦">8.2. EncodedVideoChunk Interface</a> <a href="#ref-for-idl-unsigned-long-long⑧">(2)</a> <a href="#ref-for-idl-unsigned-long-long⑨">(3)</a> <a href="#ref-for-idl-unsigned-long-long①⓪">(4)</a>
-    <li><a href="#ref-for-idl-unsigned-long-long①①">8.2.2. Attributes</a> <a href="#ref-for-idl-unsigned-long-long①②">(2)</a>
+    <li><a href="#ref-for-idl-unsigned-long-long①①">8.2.3. Attributes</a> <a href="#ref-for-idl-unsigned-long-long①②">(2)</a>
     <li><a href="#ref-for-idl-unsigned-long-long①③">9.2. AudioData Interface</a> <a href="#ref-for-idl-unsigned-long-long①④">(2)</a> <a href="#ref-for-idl-unsigned-long-long①⑤">(3)</a>
     <li><a href="#ref-for-idl-unsigned-long-long①⑥">9.2.3. Attributes</a> <a href="#ref-for-idl-unsigned-long-long①⑦">(2)</a>
     <li><a href="#ref-for-idl-unsigned-long-long①⑧">9.4. VideoFrame Interface</a> <a href="#ref-for-idl-unsigned-long-long①⑨">(2)</a> <a href="#ref-for-idl-unsigned-long-long②⓪">(3)</a> <a href="#ref-for-idl-unsigned-long-long②①">(4)</a> <a href="#ref-for-idl-unsigned-long-long②②">(5)</a> <a href="#ref-for-idl-unsigned-long-long②③">(6)</a>
@@ -5583,7 +5657,6 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
     <ul>
      <li><span class="dfn-paneled" id="term-for-aborterror">AbortError</span>
      <li><span class="dfn-paneled" id="term-for-AllowShared">AllowShared</span>
-     <li><span class="dfn-paneled" id="term-for-idl-ArrayBuffer">ArrayBuffer</span>
      <li><span class="dfn-paneled" id="term-for-ArrayBufferView">ArrayBufferView</span>
      <li><span class="dfn-paneled" id="term-for-BufferSource">BufferSource</span>
      <li><span class="dfn-paneled" id="term-for-idl-DOMException">DOMException</span>
@@ -5838,7 +5911,9 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   <a class="idl-code" data-link-type="constructor" href="#dom-encodedaudiochunk-encodedaudiochunk"><c- g>constructor</c-></a>(<a data-link-type="idl-name" href="#dictdef-encodedaudiochunkinit"><c- n>EncodedAudioChunkInit</c-></a> <a href="#dom-encodedaudiochunk-encodedaudiochunk-init-init"><code><c- g>init</c-></code></a>);
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-encodedaudiochunktype"><c- n>EncodedAudioChunkType</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="EncodedAudioChunkType" href="#dom-encodedaudiochunk-type"><c- g>type</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long" href="#dom-encodedaudiochunk-timestamp"><c- g>timestamp</c-></a>;  // microseconds
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-ArrayBuffer"><c- b>ArrayBuffer</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-encodedaudiochunk-data"><c- g>data</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-encodedaudiochunk-bytelength"><c- g>byteLength</c-></a>;
+
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-encodedaudiochunk-copyto"><c- g>copyTo</c-></a>(<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#ArrayBufferView"><c- n>ArrayBufferView</c-></a> <a href="#dom-encodedaudiochunk-copyto-dst-dst"><code><c- g>dst</c-></code></a>);
 };
 
 <c- b>dictionary</c-> <a href="#dictdef-encodedaudiochunkinit"><code><c- g>EncodedAudioChunkInit</c-></code></a> {
@@ -5858,7 +5933,9 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-encodedvideochunktype"><c- n>EncodedVideoChunkType</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="EncodedVideoChunkType" href="#dom-encodedvideochunk-type"><c- g>type</c-></a>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long" href="#dom-encodedvideochunk-timestamp"><c- g>timestamp</c-></a>;  // microseconds
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>? <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long long?" href="#dom-encodedvideochunk-duration"><c- g>duration</c-></a>;  // microseconds
-  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-ArrayBuffer"><c- b>ArrayBuffer</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-encodedvideochunk-data"><c- g>data</c-></a>;
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-encodedvideochunk-bytelength"><c- g>byteLength</c-></a>;
+
+  <a class="idl-code" data-link-type="interface" href="https://heycam.github.io/webidl/#idl-undefined"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-encodedvideochunk-copyto"><c- g>copyTo</c-></a>(<a data-link-type="idl-name" href="https://heycam.github.io/webidl/#ArrayBufferView"><c- n>ArrayBufferView</c-></a> <a href="#dom-encodedvideochunk-copyto-dst-dst"><code><c- g>dst</c-></code></a>);
 };
 
 <c- b>dictionary</c-> <a href="#dictdef-encodedvideochunkinit"><code><c- g>EncodedVideoChunkInit</c-></code></a> {
@@ -6047,8 +6124,6 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <div class="issue"> The spec should provide definitions (and possibly diagrams) for
     coded size, crop size, and display size. See <a href="https://github.com/w3c/webcodecs/issues/166">#166</a>.<a href="#issue-6c7fe7de"> ↵ </a></div>
    <div class="issue"> The spec should define explicit rules for each <code class="idl"><a data-link-type="idl" href="#enumdef-pixelformat">PixelFormat</a></code> and reference them in the step above. See <a href="https://github.com/w3c/webcodecs/issues/165">#165</a>.<a href="#issue-ca862628"> ↵ </a></div>
-   <div class="issue"> EncodedVideoChunk and EncodedAudioChunk currently expose a mutable
-data. See <a href="https://github.com/w3c/webcodecs/issues/80">#80</a>.<a href="#issue-fde64654"> ↵ </a></div>
   </div>
   <aside class="dfn-panel" data-for="codec">
    <b><a href="#codec">#codec</a></b><b>Referenced in:</b>
@@ -7109,7 +7184,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-encodedaudiochunk①">3.5. Algorithms</a>
     <li><a href="#ref-for-encodedaudiochunk②">5. AudioEncoder Interface</a>
     <li><a href="#ref-for-encodedaudiochunk③">5.5. Algorithms</a>
-    <li><a href="#ref-for-encodedaudiochunk④">8.1.1. Constructors</a>
+    <li><a href="#ref-for-encodedaudiochunk④">8.1.2. Constructors</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dictdef-encodedaudiochunkinit">
@@ -7142,7 +7217,15 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-enumdef-encodedaudiochunktype">5.5. Algorithms</a>
     <li><a href="#ref-for-enumdef-encodedaudiochunktype①">8.1. EncodedAudioChunk Interface</a> <a href="#ref-for-enumdef-encodedaudiochunktype②">(2)</a>
-    <li><a href="#ref-for-enumdef-encodedaudiochunktype③">8.1.2. Attributes</a>
+    <li><a href="#ref-for-enumdef-encodedaudiochunktype③">8.1.3. Attributes</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-encodedaudiochunk-internal-data-slot">
+   <b><a href="#dom-encodedaudiochunk-internal-data-slot">#dom-encodedaudiochunk-internal-data-slot</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-encodedaudiochunk-internal-data-slot">8.1.2. Constructors</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-internal-data-slot①">8.1.3. Attributes</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-internal-data-slot②">8.1.4. Methods</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-encodedaudiochunk-encodedaudiochunk">
@@ -7155,6 +7238,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <b><a href="#dom-encodedaudiochunk-type">#dom-encodedaudiochunk-type</a></b><b>Referenced in:</b>
    <ul>
     <li><a href="#ref-for-dom-encodedaudiochunk-type">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-type①">8.1.2. Constructors</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-encodedaudiochunk-timestamp">
@@ -7162,12 +7246,21 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-dom-encodedaudiochunk-timestamp">3.5. Algorithms</a>
     <li><a href="#ref-for-dom-encodedaudiochunk-timestamp①">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-timestamp②">8.1.2. Constructors</a>
    </ul>
   </aside>
-  <aside class="dfn-panel" data-for="dom-encodedaudiochunk-data">
-   <b><a href="#dom-encodedaudiochunk-data">#dom-encodedaudiochunk-data</a></b><b>Referenced in:</b>
+  <aside class="dfn-panel" data-for="dom-encodedaudiochunk-bytelength">
+   <b><a href="#dom-encodedaudiochunk-bytelength">#dom-encodedaudiochunk-bytelength</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dom-encodedaudiochunk-data">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-bytelength">8.1. EncodedAudioChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-bytelength①">8.1.2. Constructors</a>
+    <li><a href="#ref-for-dom-encodedaudiochunk-bytelength②">8.1.4. Methods</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-encodedaudiochunk-copyto">
+   <b><a href="#dom-encodedaudiochunk-copyto">#dom-encodedaudiochunk-copyto</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-encodedaudiochunk-copyto">8.1. EncodedAudioChunk Interface</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="encodedvideochunk">
@@ -7179,7 +7272,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-encodedvideochunk③">6.1. Internal Slots</a>
     <li><a href="#ref-for-encodedvideochunk④">6.5. Algorithms</a>
     <li><a href="#ref-for-encodedvideochunk⑤">7.8. VideoEncoderConfig</a> <a href="#ref-for-encodedvideochunk⑥">(2)</a> <a href="#ref-for-encodedvideochunk⑦">(3)</a> <a href="#ref-for-encodedvideochunk⑧">(4)</a>
-    <li><a href="#ref-for-encodedvideochunk⑨">8.2.1. Constructors</a>
+    <li><a href="#ref-for-encodedvideochunk⑨">8.2.2. Constructors</a>
     <li><a href="#ref-for-encodedvideochunk①⓪">9.4.1. Internal Slots</a> <a href="#ref-for-encodedvideochunk①①">(2)</a>
     <li><a href="#ref-for-encodedvideochunk①②">9.4.3. Attributes</a> <a href="#ref-for-encodedvideochunk①③">(2)</a>
    </ul>
@@ -7220,7 +7313,15 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-enumdef-encodedvideochunktype">6.5. Algorithms</a>
     <li><a href="#ref-for-enumdef-encodedvideochunktype①">8.2. EncodedVideoChunk Interface</a> <a href="#ref-for-enumdef-encodedvideochunktype②">(2)</a>
-    <li><a href="#ref-for-enumdef-encodedvideochunktype③">8.2.2. Attributes</a>
+    <li><a href="#ref-for-enumdef-encodedvideochunktype③">8.2.3. Attributes</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-encodedvideochunk-internal-data-slot">
+   <b><a href="#dom-encodedvideochunk-internal-data-slot">#dom-encodedvideochunk-internal-data-slot</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-encodedvideochunk-internal-data-slot">8.2.2. Constructors</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-internal-data-slot①">8.2.3. Attributes</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-internal-data-slot②">8.2.4. Methods</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-encodedvideochunk-encodedvideochunk">
@@ -7233,6 +7334,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <b><a href="#dom-encodedvideochunk-type">#dom-encodedvideochunk-type</a></b><b>Referenced in:</b>
    <ul>
     <li><a href="#ref-for-dom-encodedvideochunk-type">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-type①">8.2.2. Constructors</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-encodedvideochunk-timestamp">
@@ -7240,6 +7342,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-dom-encodedvideochunk-timestamp">4.5. Algorithms</a>
     <li><a href="#ref-for-dom-encodedvideochunk-timestamp①">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-timestamp②">8.2.2. Constructors</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-encodedvideochunk-duration">
@@ -7247,12 +7350,21 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-dom-encodedvideochunk-duration">4.5. Algorithms</a>
     <li><a href="#ref-for-dom-encodedvideochunk-duration①">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-duration②">8.2.2. Constructors</a> <a href="#ref-for-dom-encodedvideochunk-duration③">(2)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-encodedvideochunk-bytelength">
+   <b><a href="#dom-encodedvideochunk-bytelength">#dom-encodedvideochunk-bytelength</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-encodedvideochunk-bytelength">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-bytelength①">8.2.2. Constructors</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-bytelength②">8.2.4. Methods</a>
    </ul>
   </aside>
-  <aside class="dfn-panel" data-for="dom-encodedvideochunk-data">
-   <b><a href="#dom-encodedvideochunk-data">#dom-encodedvideochunk-data</a></b><b>Referenced in:</b>
+  <aside class="dfn-panel" data-for="dom-encodedvideochunk-copyto">
+   <b><a href="#dom-encodedvideochunk-copyto">#dom-encodedvideochunk-copyto</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dom-encodedvideochunk-data">8.2. EncodedVideoChunk Interface</a>
+    <li><a href="#ref-for-dom-encodedvideochunk-copyto">8.2. EncodedVideoChunk Interface</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="media-resource">