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+  <meta content="678a2653b9ab5ac4b8d93749ec22616996c5f547" name="document-revision">
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@@ -648,7 +648,7 @@
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    <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/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">WebRTC Encoded Transform</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2023-12-07">7 December 2023</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2023-12-12">12 December 2023</time></p>
    <details open>
     <summary>More details about this document</summary>
     <div data-fill-with="spec-metadata">
@@ -749,7 +749,8 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
       <li><a href="#RTCRtpScriptTransformer-interfaces"><span class="secno">4.6</span> <span class="content">Interfaces</span></a>
       <li><a href="#RTCRtpScriptTransform-operations"><span class="secno">4.7</span> <span class="content">Operations</span></a>
       <li><a href="#RTCRtpScriptTransformer-attributes"><span class="secno">4.8</span> <span class="content">Attributes</span></a>
-      <li><a href="#KeyFrame-algorithms"><span class="secno">4.9</span> <span class="content">KeyFrame Algorithms</span></a>
+      <li><a href="#RTCRtpScriptTransformer-events"><span class="secno">4.9</span> <span class="content">Events</span></a>
+      <li><a href="#KeyFrame-algorithms"><span class="secno">4.10</span> <span class="content">KeyFrame Algorithms</span></a>
      </ol>
     <li>
      <a href="#rtcrtpsender-extension"><span class="secno">5</span> <span class="content">RTCRtpSender extension</span></a>
@@ -1338,18 +1339,28 @@ <h3 class="heading settled" data-level="4.6" id="RTCRtpScriptTransformer-interfa
 };
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed⑤"><c- g>Exposed</c-></a>=<c- n>DedicatedWorker</c->]
-<c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="rtcrtpscripttransformer"><code><c- g>RTCRtpScriptTransformer</c-></code></dfn> {
-    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#readablestream" id="ref-for-readablestream①"><c- n>ReadableStream</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ReadableStream" href="#dom-rtcrtpscripttransformer-readable" id="ref-for-dom-rtcrtpscripttransformer-readable"><c- g>readable</c-></a>;
-    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#writablestream" id="ref-for-writablestream①"><c- n>WritableStream</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="WritableStream" href="#dom-rtcrtpscripttransformer-writable" id="ref-for-dom-rtcrtpscripttransformer-writable"><c- g>writable</c-></a>;
+<c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="rtcrtpscripttransformer"><code><c- g>RTCRtpScriptTransformer</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#eventtarget" id="ref-for-eventtarget①"><c- n>EventTarget</c-></a> {
+    // Attributes and methods related to the transformer source
+    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#readablestream" id="ref-for-readablestream①"><c- n>ReadableStream</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="attribute" data-export data-readonly data-type="ReadableStream" id="dom-rtcrtpscripttransformer-readable"><code><c- g>readable</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-readable"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise①"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long③"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="method" data-export data-lt="generateKeyFrame(rid)|generateKeyFrame()" id="dom-rtcrtpscripttransformer-generatekeyframe"><code><c- g>generateKeyFrame</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-generatekeyframe"></a></dfn>(<c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer/generateKeyFrame(rid), RTCRtpScriptTransformer/generateKeyFrame()" data-dfn-type="argument" data-export id="dom-rtcrtpscripttransformer-generatekeyframe-rid-rid"><code><c- g>rid</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-generatekeyframe-rid-rid"></a></dfn>);
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise②"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①"><c- b>undefined</c-></a>> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="method" data-export data-lt="sendKeyFrameRequest()" id="dom-rtcrtpscripttransformer-sendkeyframerequest"><code><c- g>sendKeyFrameRequest</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-sendkeyframerequest"></a></dfn>();
+    // Attributes and methods related to the transformer sink
+    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#writablestream" id="ref-for-writablestream①"><c- n>WritableStream</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="attribute" data-export data-readonly data-type="WritableStream" id="dom-rtcrtpscripttransformer-writable"><code><c- g>writable</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-writable"></a></dfn>;
+    <c- b>attribute</c-> <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler②"><c- n>EventHandler</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="attribute" data-export data-type="EventHandler" id="dom-rtcrtpscripttransformer-onkeyframerequest"><code><c- g>onkeyframerequest</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-onkeyframerequest"></a></dfn>;
+    // Attributes for configuring the Javascript code
     <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any②"><c- b>any</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="any" href="#dom-rtcrtpscripttransformer-options" id="ref-for-dom-rtcrtpscripttransformer-options"><c- g>options</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise①"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long③"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpscripttransformer-generatekeyframe" id="ref-for-dom-rtcrtpscripttransformer-generatekeyframe"><c- g>generateKeyFrame</c-></a>(<c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransformer/generateKeyFrame(rid), RTCRtpScriptTransformer/generateKeyFrame()" data-dfn-type="argument" data-export id="dom-rtcrtpscripttransformer-generatekeyframe-rid-rid"><code><c- g>rid</c-></code><a class="self-link" href="#dom-rtcrtpscripttransformer-generatekeyframe-rid-rid"></a></dfn>);
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise②"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpscripttransformer-sendkeyframerequest" id="ref-for-dom-rtcrtpscripttransformer-sendkeyframerequest"><c- g>sendKeyFrameRequest</c-></a>();
 };
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed⑥"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="rtcrtpscripttransform"><code><c- g>RTCRtpScriptTransform</c-></code></dfn> {
     <a class="idl-code" data-link-type="constructor" href="#dom-rtcrtpscripttransform-rtcrtpscripttransform" id="ref-for-dom-rtcrtpscripttransform-rtcrtpscripttransform"><c- g>constructor</c-></a>(<a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/workers.html#worker" id="ref-for-worker"><c- n>Worker</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform/RTCRtpScriptTransform(worker, options, transfer), RTCRtpScriptTransform/constructor(worker, options, transfer), RTCRtpScriptTransform/RTCRtpScriptTransform(worker, options), RTCRtpScriptTransform/constructor(worker, options), RTCRtpScriptTransform/RTCRtpScriptTransform(worker), RTCRtpScriptTransform/constructor(worker)" data-dfn-type="argument" data-export id="dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-worker"><code><c- g>worker</c-></code><a class="self-link" href="#dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-worker"></a></dfn>, <c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform/RTCRtpScriptTransform(worker, options, transfer), RTCRtpScriptTransform/constructor(worker, options, transfer), RTCRtpScriptTransform/RTCRtpScriptTransform(worker, options), RTCRtpScriptTransform/constructor(worker, options), RTCRtpScriptTransform/RTCRtpScriptTransform(worker), RTCRtpScriptTransform/constructor(worker)" data-dfn-type="argument" data-export id="dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-options"><code><c- g>options</c-></code><a class="self-link" href="#dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-options"></a></dfn>, <c- b>optional</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence③"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-object" id="ref-for-idl-object"><c- b>object</c-></a>> <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform/RTCRtpScriptTransform(worker, options, transfer), RTCRtpScriptTransform/constructor(worker, options, transfer), RTCRtpScriptTransform/RTCRtpScriptTransform(worker, options), RTCRtpScriptTransform/constructor(worker, options), RTCRtpScriptTransform/RTCRtpScriptTransform(worker), RTCRtpScriptTransform/constructor(worker)" data-dfn-type="argument" data-export id="dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-transfer"><code><c- g>transfer</c-></code><a class="self-link" href="#dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-transfer"></a></dfn>);
 };
+
+[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed⑦"><c- g>Exposed</c-></a>=<c- n>DedicatedWorker</c->]
+<c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="keyframerequestevent"><code><c- g>KeyFrameRequestEvent</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#event" id="ref-for-event②"><c- n>Event</c-></a> {
+  <dfn class="idl-code" data-dfn-for="KeyFrameRequestEvent" data-dfn-type="constructor" data-export data-lt="KeyFrameRequestEvent(type, rid)|constructor(type, rid)|KeyFrameRequestEvent(type)|constructor(type)" id="dom-keyframerequestevent-keyframerequestevent"><code><c- g>constructor</c-></code><a class="self-link" href="#dom-keyframerequestevent-keyframerequestevent"></a></dfn>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑥"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="KeyFrameRequestEvent/KeyFrameRequestEvent(type, rid), KeyFrameRequestEvent/constructor(type, rid), KeyFrameRequestEvent/KeyFrameRequestEvent(type), KeyFrameRequestEvent/constructor(type)" data-dfn-type="argument" data-export id="dom-keyframerequestevent-keyframerequestevent-type-rid-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-keyframerequestevent-keyframerequestevent-type-rid-type"></a></dfn>, <c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="KeyFrameRequestEvent/KeyFrameRequestEvent(type, rid), KeyFrameRequestEvent/constructor(type, rid), KeyFrameRequestEvent/KeyFrameRequestEvent(type), KeyFrameRequestEvent/constructor(type)" data-dfn-type="argument" data-export id="dom-keyframerequestevent-keyframerequestevent-type-rid-rid"><code><c- g>rid</c-></code><a class="self-link" href="#dom-keyframerequestevent-keyframerequestevent-type-rid-rid"></a></dfn>);
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑧"><c- b>DOMString</c-></a>? <dfn class="dfn-paneled idl-code" data-dfn-for="KeyFrameRequestEvent" data-dfn-type="attribute" data-export data-readonly data-type="DOMString?" id="dom-keyframerequestevent-rid"><code><c- g>rid</c-></code></dfn>;
+};
 </pre>
    <h3 class="heading settled" data-level="4.7" id="RTCRtpScriptTransform-operations"><span class="secno">4.7. </span><span class="content">Operations</span><a class="self-link" href="#RTCRtpScriptTransform-operations"></a></h3>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="constructor" data-export data-lt="RTCRtpScriptTransform(worker, options, transfer)|constructor(worker, options, transfer)|RTCRtpScriptTransform(worker, options)|constructor(worker, options)|RTCRtpScriptTransform(worker)|constructor(worker)" id="dom-rtcrtpscripttransform-rtcrtpscripttransform"><code>new RTCRtpScriptTransform(<var>worker</var>, <var>options</var>, <var>transfer</var>)</code></dfn> constructor steps are:</p>
@@ -1409,7 +1420,7 @@ <h3 class="heading settled" data-level="4.7" id="RTCRtpScriptTransform-operation
        <p>Set <var>transformer</var>.<code>[[depacketizer]]</code> to <var>depacketizer</var>.</p>
      </ol>
    </ol>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="method" data-export data-lt="generateKeyFrame(rid)|generateKeyFrame()" id="dom-rtcrtpscripttransformer-generatekeyframe"><code>generateKeyFrame(<var>rid</var>)</code></dfn> method steps are:</p>
+   <p>The <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="method" data-export id="dom-rtcrtpscripttransform-generatekeyframe"><code>generateKeyFrame(<var>rid</var>)</code><a class="self-link" href="#dom-rtcrtpscripttransform-generatekeyframe"></a></dfn> method steps are:</p>
    <ol>
     <li data-md>
      <p>Let <var>promise</var> be a new promise.</p>
@@ -1418,7 +1429,7 @@ <h3 class="heading settled" data-level="4.7" id="RTCRtpScriptTransform-operation
     <li data-md>
      <p>Return <var>promise</var>.</p>
    </ol>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="method" data-export id="dom-rtcrtpscripttransformer-sendkeyframerequest"><code>sendKeyFrameRequest()</code></dfn> method steps are:</p>
+   <p>The <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="method" data-export id="dom-rtcrtpscripttransform-sendkeyframerequest"><code>sendKeyFrameRequest()</code><a class="self-link" href="#dom-rtcrtpscripttransform-sendkeyframerequest"></a></dfn> method steps are:</p>
    <ol>
     <li data-md>
      <p>Let <var>promise</var> be a new promise.</p>
@@ -1436,17 +1447,39 @@ <h3 class="heading settled" data-level="4.8" id="RTCRtpScriptTransformer-attribu
     <li data-md>
      <p>Return <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②②">this</a>.<code>[[options]]</code>.</p>
    </ol>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="attribute" data-export id="dom-rtcrtpscripttransformer-readable"><code>readable</code></dfn> getter steps are:</p>
+   <p>The <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="attribute" data-export id="dom-rtcrtpscripttransform-readable"><code>readable</code><a class="self-link" href="#dom-rtcrtpscripttransform-readable"></a></dfn> getter steps are:</p>
    <ol>
     <li data-md>
      <p>Return <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②③">this</a>.<code>[[readable]]</code>.</p>
    </ol>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpScriptTransformer" data-dfn-type="attribute" data-export id="dom-rtcrtpscripttransformer-writable"><code>writable</code></dfn> getter steps are:</p>
+   <p>The <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="attribute" data-export id="dom-rtcrtpscripttransform-writable"><code>writable</code><a class="self-link" href="#dom-rtcrtpscripttransform-writable"></a></dfn> getter steps are:</p>
    <ol>
     <li data-md>
      <p>Return <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②④">this</a>.<code>[[writable]]</code>.</p>
    </ol>
-   <h3 class="heading settled" data-level="4.9" id="KeyFrame-algorithms"><span class="secno">4.9. </span><span class="content">KeyFrame Algorithms</span><a class="self-link" href="#KeyFrame-algorithms"></a></h3>
+   <p>The <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="attribute" data-export id="dom-rtcrtpscripttransform-onbandwidthestimate"><code>onbandwidthestimate</code><a class="self-link" href="#dom-rtcrtpscripttransform-onbandwidthestimate"></a></dfn> EventHandler has type bandwidthestimate.</p>
+   <p>The <dfn class="idl-code" data-dfn-for="RTCRtpScriptTransform" data-dfn-type="attribute" data-export id="dom-rtcrtpscripttransform-onkeyframerequest"><code>onkeyframerequest</code><a class="self-link" href="#dom-rtcrtpscripttransform-onkeyframerequest"></a></dfn> EventHandler has type keyframerequest.</p>
+   <h3 class="heading settled" data-level="4.9" id="RTCRtpScriptTransformer-events"><span class="secno">4.9. </span><span class="content">Events</span><a class="self-link" href="#RTCRtpScriptTransformer-events"></a></h3>
+   <p>The following event fires on an <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑥">RTCRtpScriptTransformer</a></code>:</p>
+   <ul>
+    <li data-md>
+     <p>keyframerequest of type <code class="idl"><a data-link-type="idl" href="#keyframerequestevent" id="ref-for-keyframerequestevent">KeyFrameRequestEvent</a></code> - fired when the sink determines that a key frame has been requested.</p>
+   </ul>
+   <p>The steps that generate an event of type <code class="idl"><a data-link-type="idl" href="#keyframerequestevent" id="ref-for-keyframerequestevent①">KeyFrameRequestEvent</a></code> are as follows:</p>
+   <p>Given a <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑦">RTCRtpScriptTransformer</a></code> <var>transform</var>:</p>
+   <p>When <var>transform</var>’s <code>[[encoder]]</code> receives a keyframe request, for instance from an incoming RTCP Picture Loss Indication (PLI)
+or Full Intra Refresh (FIR), queue a task to perform the following steps:</p>
+   <ol>
+    <li data-md>
+     <p>Set <var>rid</var> to the RID of the appropriate layer, or undefined if the request is not for a specific layer.</p>
+    <li data-md>
+     <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire④">Fire an event</a> named <code>keyframerequest</code> at <var>transform</var> using <code class="idl"><a data-link-type="idl" href="#keyframerequestevent" id="ref-for-keyframerequestevent②">KeyFrameRequestEvent</a></code> with its <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#dom-event-cancelable" id="ref-for-dom-event-cancelable">cancelable</a></code> attribute initialized to "true", and with <code class="idl"><a data-link-type="idl" href="#dom-keyframerequestevent-rid" id="ref-for-dom-keyframerequestevent-rid">rid</a></code> set to <var>rid</var>.</p>
+    <li data-md>
+     <p>If the event’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#canceled-flag" id="ref-for-canceled-flag">canceled flag</a> is true, abort these steps.</p>
+    <li data-md>
+     <p>Run the <a data-link-type="abstract-op" href="#abstract-opdef-generate-key-frame-algorithm" id="ref-for-abstract-opdef-generate-key-frame-algorithm①">generate key frame algorithm</a> with a new promise, <var>transform</var>.<code>[[encoder]]</code> and <var>rid</var>.</p>
+   </ol>
+   <h3 class="heading settled" data-level="4.10" id="KeyFrame-algorithms"><span class="secno">4.10. </span><span class="content">KeyFrame Algorithms</span><a class="self-link" href="#KeyFrame-algorithms"></a></h3>
    <p>The <dfn class="dfn-paneled" data-dfn-type="abstract-op" data-export id="abstract-opdef-generate-key-frame-algorithm">generate key frame algorithm</dfn>, given <var>promise</var>, <var>encoder</var> and <var>rid</var>, is defined by running these steps:</p>
    <ol>
     <li data-md>
@@ -1484,7 +1517,7 @@ <h3 class="heading settled" data-level="4.9" id="KeyFrame-algorithms"><span clas
        <p>If <var>shouldTriggerKeyFrame</var> is <code>true</code>, instruct <var>videoEncoder</var> to generate a key frame for the next provided video frame.</p>
      </ol>
    </ol>
-   <p>For any <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑥">RTCRtpScriptTransformer</a></code> named <var>transformer</var>, the following steps are run just before any <var>frame</var> is enqueued in <var>transformer</var>.<code>[[readable]]</code>:</p>
+   <p>For any <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑧">RTCRtpScriptTransformer</a></code> named <var>transformer</var>, the following steps are run just before any <var>frame</var> is enqueued in <var>transformer</var>.<code>[[readable]]</code>:</p>
    <ol>
     <li data-md>
      <p>Let <var>encoder</var> be <var>transformer</var>.<code>[[encoder]]</code>.</p>
@@ -1505,7 +1538,7 @@ <h3 class="heading settled" data-level="4.9" id="KeyFrame-algorithms"><span clas
        </ol>
      </ol>
    </ol>
-   <p>By resolving the promises just before enqueuing the corresponding key frame in a <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑦">RTCRtpScriptTransformer</a></code>'s readable,
+   <p>By resolving the promises just before enqueuing the corresponding key frame in a <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑨">RTCRtpScriptTransformer</a></code>'s readable,
 the resolution callbacks of the promises are always executed just before the corresponding key frame is exposed.
 If the promise is associated to several rid values, it will be resolved when the first key frame corresponding to one the rid value is enqueued.</p>
    <p>The <dfn class="dfn-paneled" data-dfn-type="abstract-op" data-export id="abstract-opdef-send-request-key-frame-algorithm">send request key frame algorithm</dfn>, given <var>promise</var> and <var>depacketizer</var>, is defined by running these steps:</p>
@@ -1527,9 +1560,9 @@ <h3 class="heading settled" data-level="4.9" id="KeyFrame-algorithms"><span clas
      </ol>
    </ol>
    <h2 class="heading settled" data-level="5" id="rtcrtpsender-extension"><span class="secno">5. </span><span class="content">RTCRtpSender extension</span><a class="self-link" href="#rtcrtpsender-extension"></a></h2>
-   <p>An additional API on <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webrtc-pc/#dom-rtcrtpsender" id="ref-for-dom-rtcrtpsender①①">RTCRtpSender</a></code> is added to complement the generation of key frame added to <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer⑧">RTCRtpScriptTransformer</a></code>.</p>
+   <p>An additional API on <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webrtc-pc/#dom-rtcrtpsender" id="ref-for-dom-rtcrtpsender①①">RTCRtpSender</a></code> is added to complement the generation of key frame added to <code class="idl"><a data-link-type="idl" href="#rtcrtpscripttransformer" id="ref-for-rtcrtpscripttransformer①⓪">RTCRtpScriptTransformer</a></code>.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="https://w3c.github.io/webrtc-pc/#dom-rtcrtpsender" id="ref-for-dom-rtcrtpsender①②"><c- g>RTCRtpSender</c-></a> {
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise③"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined②"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpsender-generatekeyframe" id="ref-for-dom-rtcrtpsender-generatekeyframe"><c- g>generateKeyFrame</c-></a>(<c- b>optional</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a> &lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑥"><c- b>DOMString</c-></a>> <dfn class="idl-code" data-dfn-for="RTCRtpSender/generateKeyFrame(rids), RTCRtpSender/generateKeyFrame()" data-dfn-type="argument" data-export id="dom-rtcrtpsender-generatekeyframe-rids-rids"><code><c- g>rids</c-></code><a class="self-link" href="#dom-rtcrtpsender-generatekeyframe-rids-rids"></a></dfn>);
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise③"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined②"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpsender-generatekeyframe" id="ref-for-dom-rtcrtpsender-generatekeyframe"><c- g>generateKeyFrame</c-></a>(<c- b>optional</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a> &lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑨"><c- b>DOMString</c-></a>> <dfn class="idl-code" data-dfn-for="RTCRtpSender/generateKeyFrame(rids), RTCRtpSender/generateKeyFrame()" data-dfn-type="argument" data-export id="dom-rtcrtpsender-generatekeyframe-rids-rids"><code><c- g>rids</c-></code><a class="self-link" href="#dom-rtcrtpsender-generatekeyframe-rids-rids"></a></dfn>);
 };
 </pre>
    <h3 class="heading settled" data-level="5.1" id="sender-operation"><span class="secno">5.1. </span><span class="content">Extension operation</span><a class="self-link" href="#sender-operation"></a></h3>
@@ -1538,7 +1571,7 @@ <h3 class="heading settled" data-level="5.1" id="sender-operation"><span class="
     <li data-md>
      <p>Let <var>promise</var> be a new promise.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/infrastructure.html#in-parallel" id="ref-for-in-parallel⑤">In parallel</a>, run the <a data-link-type="abstract-op" href="#abstract-opdef-generate-key-frame-algorithm" id="ref-for-abstract-opdef-generate-key-frame-algorithm①">generate key frame algorithm</a> with <var>promise</var>, <var>this</var>’s encoder and <var>rids</var>.</p>
+     <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/infrastructure.html#in-parallel" id="ref-for-in-parallel⑤">In parallel</a>, run the <a data-link-type="abstract-op" href="#abstract-opdef-generate-key-frame-algorithm" id="ref-for-abstract-opdef-generate-key-frame-algorithm②">generate key frame algorithm</a> with <var>promise</var>, <var>this</var>’s encoder and <var>rids</var>.</p>
     <li data-md>
      <p>Return <var>promise</var>.</p>
    </ol>
@@ -1610,7 +1643,9 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#abstract-opdef-chain-transform-algorithm">chain transform algorithm</a><span>, in § 2.2</span>
    <li><a href="#dom-sframetransform-sframetransform">constructor()</a><span>, in § 3</span>
    <li><a href="#dom-sframetransform-sframetransform">constructor(options)</a><span>, in § 3</span>
+   <li><a href="#dom-keyframerequestevent-keyframerequestevent">constructor(type)</a><span>, in § 4.6</span>
    <li><a href="#dom-sframetransformerrorevent-sframetransformerrorevent">constructor(type, eventInitDict)</a><span>, in § 3</span>
+   <li><a href="#dom-keyframerequestevent-keyframerequestevent">constructor(type, rid)</a><span>, in § 4.6</span>
    <li><a href="#dom-rtcrtpscripttransform-rtcrtpscripttransform">constructor(worker)</a><span>, in § 4.7</span>
    <li><a href="#dom-rtcrtpscripttransform-rtcrtpscripttransform">constructor(worker, options)</a><span>, in § 4.7</span>
    <li><a href="#dom-rtcrtpscripttransform-rtcrtpscripttransform">constructor(worker, options, transfer)</a><span>, in § 4.7</span>
@@ -1650,11 +1685,16 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li>
     generateKeyFrame()
     <ul>
-     <li><a href="#dom-rtcrtpscripttransformer-generatekeyframe">method for RTCRtpScriptTransformer</a><span>, in § 4.7</span>
+     <li><a href="#dom-rtcrtpscripttransformer-generatekeyframe">method for RTCRtpScriptTransformer</a><span>, in § 4.6</span>
      <li><a href="#dom-rtcrtpsender-generatekeyframe">method for RTCRtpSender</a><span>, in § 5.1</span>
     </ul>
-   <li><a href="#abstract-opdef-generate-key-frame-algorithm">generate key frame algorithm</a><span>, in § 4.9</span>
-   <li><a href="#dom-rtcrtpscripttransformer-generatekeyframe">generateKeyFrame(rid)</a><span>, in § 4.7</span>
+   <li><a href="#abstract-opdef-generate-key-frame-algorithm">generate key frame algorithm</a><span>, in § 4.10</span>
+   <li>
+    generateKeyFrame(rid)
+    <ul>
+     <li><a href="#dom-rtcrtpscripttransform-generatekeyframe">method for RTCRtpScriptTransform</a><span>, in § 4.7</span>
+     <li><a href="#dom-rtcrtpscripttransformer-generatekeyframe">method for RTCRtpScriptTransformer</a><span>, in § 4.6</span>
+    </ul>
    <li><a href="#dom-rtcrtpsender-generatekeyframe">generateKeyFrame(rids)</a><span>, in § 5.1</span>
    <li>
     getMetadata()
@@ -1665,6 +1705,9 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dom-rtcencodedvideoframemetadata-height">height</a><span>, in § 4.2</span>
    <li><a href="#dom-rtcencodedvideoframetype-key">"key"</a><span>, in § 4.1</span>
    <li><a href="#dom-rtcencodedvideoframetype-key">key</a><span>, in § 4.1</span>
+   <li><a href="#keyframerequestevent">KeyFrameRequestEvent</a><span>, in § 4.6</span>
+   <li><a href="#dom-keyframerequestevent-keyframerequestevent">KeyFrameRequestEvent(type)</a><span>, in § 4.6</span>
+   <li><a href="#dom-keyframerequestevent-keyframerequestevent">KeyFrameRequestEvent(type, rid)</a><span>, in § 4.6</span>
    <li><a href="#dom-sframetransformerroreventtype-keyid">"keyID"</a><span>, in § 3</span>
    <li>
     keyID
@@ -1678,7 +1721,14 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-rtcencodedaudioframemetadata-mimetype">dict-member for RTCEncodedAudioFrameMetadata</a><span>, in § 4.4.1</span>
      <li><a href="#dom-rtcencodedvideoframemetadata-mimetype">dict-member for RTCEncodedVideoFrameMetadata</a><span>, in § 4.2.1</span>
     </ul>
+   <li><a href="#dom-rtcrtpscripttransform-onbandwidthestimate">onbandwidthestimate</a><span>, in § 4.8</span>
    <li><a href="#dom-sframetransform-onerror">onerror</a><span>, in § 3</span>
+   <li>
+    onkeyframerequest
+    <ul>
+     <li><a href="#dom-rtcrtpscripttransform-onkeyframerequest">attribute for RTCRtpScriptTransform</a><span>, in § 4.8</span>
+     <li><a href="#dom-rtcrtpscripttransformer-onkeyframerequest">attribute for RTCRtpScriptTransformer</a><span>, in § 4.6</span>
+    </ul>
    <li><a href="#dom-dedicatedworkerglobalscope-onrtctransform">onrtctransform</a><span>, in § 4.6</span>
    <li><a href="#dom-rtcrtpscripttransformer-options">options</a><span>, in § 4.8</span>
    <li>
@@ -1687,8 +1737,14 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-rtcencodedaudioframemetadata-payloadtype">dict-member for RTCEncodedAudioFrameMetadata</a><span>, in § 4.4.1</span>
      <li><a href="#dom-rtcencodedvideoframemetadata-payloadtype">dict-member for RTCEncodedVideoFrameMetadata</a><span>, in § 4.2.1</span>
     </ul>
-   <li><a href="#dom-rtcrtpscripttransformer-readable">readable</a><span>, in § 4.8</span>
+   <li>
+    readable
+    <ul>
+     <li><a href="#dom-rtcrtpscripttransform-readable">attribute for RTCRtpScriptTransform</a><span>, in § 4.8</span>
+     <li><a href="#dom-rtcrtpscripttransformer-readable">attribute for RTCRtpScriptTransformer</a><span>, in § 4.6</span>
+    </ul>
    <li><a href="#abstract-opdef-readencodeddata">readEncodedData</a><span>, in § 2.1.2</span>
+   <li><a href="#dom-keyframerequestevent-rid">rid</a><span>, in § 4.6</span>
    <li><a href="#dom-sframetransformoptions-role">role</a><span>, in § 3</span>
    <li><a href="#rtcencodedaudioframe">RTCEncodedAudioFrame</a><span>, in § 4.5</span>
    <li><a href="#dictdef-rtcencodedaudioframemetadata">RTCEncodedAudioFrameMetadata</a><span>, in § 4.4</span>
@@ -1709,8 +1765,13 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-rtcencodedaudioframemetadata-rtptimestamp">dict-member for RTCEncodedAudioFrameMetadata</a><span>, in § 4.4.1</span>
      <li><a href="#dom-rtcencodedvideoframemetadata-rtptimestamp">dict-member for RTCEncodedVideoFrameMetadata</a><span>, in § 4.2.1</span>
     </ul>
-   <li><a href="#dom-rtcrtpscripttransformer-sendkeyframerequest">sendKeyFrameRequest()</a><span>, in § 4.7</span>
-   <li><a href="#abstract-opdef-send-request-key-frame-algorithm">send request key frame algorithm</a><span>, in § 4.9</span>
+   <li>
+    sendKeyFrameRequest()
+    <ul>
+     <li><a href="#dom-rtcrtpscripttransform-sendkeyframerequest">method for RTCRtpScriptTransform</a><span>, in § 4.7</span>
+     <li><a href="#dom-rtcrtpscripttransformer-sendkeyframerequest">method for RTCRtpScriptTransformer</a><span>, in § 4.6</span>
+    </ul>
+   <li><a href="#abstract-opdef-send-request-key-frame-algorithm">send request key frame algorithm</a><span>, in § 4.10</span>
    <li><a href="#dom-rtcencodedaudioframemetadata-sequencenumber">sequenceNumber</a><span>, in § 4.4.1</span>
    <li><a href="#dom-sframetransform-setencryptionkey">setEncryptionKey(key)</a><span>, in § 3.2</span>
    <li><a href="#dom-sframetransform-setencryptionkey">setEncryptionKey(key, keyID)</a><span>, in § 3.2</span>
@@ -1738,7 +1799,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dom-rtctransformevent-transformer">transformer</a><span>, in § 4.6</span>
    <li><a href="#dom-rtcencodedvideoframe-type">type</a><span>, in § 4.3.1</span>
    <li><a href="#dom-rtcencodedvideoframemetadata-width">width</a><span>, in § 4.2</span>
-   <li><a href="#dom-rtcrtpscripttransformer-writable">writable</a><span>, in § 4.8</span>
+   <li>
+    writable
+    <ul>
+     <li><a href="#dom-rtcrtpscripttransform-writable">attribute for RTCRtpScriptTransform</a><span>, in § 4.8</span>
+     <li><a href="#dom-rtcrtpscripttransformer-writable">attribute for RTCRtpScriptTransformer</a><span>, in § 4.6</span>
+    </ul>
    <li><a href="#abstract-opdef-writeencodeddata">writeEncodedData</a><span>, in § 2.1.2</span>
   </ul>
   <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
@@ -1752,6 +1818,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="2bc0cdf4">EventTarget</span>
      <li><span class="dfn-paneled" id="535dd335">aborted</span>
      <li><span class="dfn-paneled" id="87bc23a5">add</span>
+     <li><span class="dfn-paneled" id="8c407366">cancelable</span>
+     <li><span class="dfn-paneled" id="2e9f6464">canceled flag</span>
      <li><span class="dfn-paneled" id="5fd23811">fire an event</span>
      <li><span class="dfn-paneled" id="2296404c">signal abort</span>
     </ul>
@@ -2016,12 +2084,16 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 };
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=<c- n>DedicatedWorker</c->]
-<c- b>interface</c-> <a href="#rtcrtpscripttransformer"><code><c- g>RTCRtpScriptTransformer</c-></code></a> {
-    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#readablestream"><c- n>ReadableStream</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ReadableStream" href="#dom-rtcrtpscripttransformer-readable"><c- g>readable</c-></a>;
-    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#writablestream"><c- n>WritableStream</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="WritableStream" href="#dom-rtcrtpscripttransformer-writable"><c- g>writable</c-></a>;
+<c- b>interface</c-> <a href="#rtcrtpscripttransformer"><code><c- g>RTCRtpScriptTransformer</c-></code></a> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#eventtarget"><c- n>EventTarget</c-></a> {
+    // Attributes and methods related to the transformer source
+    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#readablestream"><c- n>ReadableStream</c-></a> <a data-readonly data-type="ReadableStream" href="#dom-rtcrtpscripttransformer-readable"><code><c- g>readable</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>> <a href="#dom-rtcrtpscripttransformer-generatekeyframe"><code><c- g>generateKeyFrame</c-></code></a>(<c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a href="#dom-rtcrtpscripttransformer-generatekeyframe-rid-rid"><code><c- g>rid</c-></code></a>);
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a>> <a href="#dom-rtcrtpscripttransformer-sendkeyframerequest"><code><c- g>sendKeyFrameRequest</c-></code></a>();
+    // Attributes and methods related to the transformer sink
+    <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#writablestream"><c- n>WritableStream</c-></a> <a data-readonly data-type="WritableStream" href="#dom-rtcrtpscripttransformer-writable"><code><c- g>writable</c-></code></a>;
+    <c- b>attribute</c-> <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler"><c- n>EventHandler</c-></a> <a data-type="EventHandler" href="#dom-rtcrtpscripttransformer-onkeyframerequest"><code><c- g>onkeyframerequest</c-></code></a>;
+    // Attributes for configuring the Javascript code
     <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="any" href="#dom-rtcrtpscripttransformer-options"><c- g>options</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpscripttransformer-generatekeyframe"><c- g>generateKeyFrame</c-></a>(<c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a href="#dom-rtcrtpscripttransformer-generatekeyframe-rid-rid"><code><c- g>rid</c-></code></a>);
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpscripttransformer-sendkeyframerequest"><c- g>sendKeyFrameRequest</c-></a>();
 };
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=<c- n>Window</c->]
@@ -2029,6 +2101,12 @@ <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-rtcrtpscripttransform-rtcrtpscripttransform"><c- g>constructor</c-></a>(<a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/workers.html#worker"><c- n>Worker</c-></a> <a href="#dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-worker"><code><c- g>worker</c-></code></a>, <c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-options"><code><c- g>options</c-></code></a>, <c- b>optional</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-object"><c- b>object</c-></a>> <a href="#dom-rtcrtpscripttransform-rtcrtpscripttransform-worker-options-transfer-transfer"><code><c- g>transfer</c-></code></a>);
 };
 
+[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=<c- n>DedicatedWorker</c->]
+<c- b>interface</c-> <a href="#keyframerequestevent"><code><c- g>KeyFrameRequestEvent</c-></code></a> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#event"><c- n>Event</c-></a> {
+  <a href="#dom-keyframerequestevent-keyframerequestevent"><code><c- g>constructor</c-></code></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a href="#dom-keyframerequestevent-keyframerequestevent-type-rid-type"><code><c- g>type</c-></code></a>, <c- b>optional</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a href="#dom-keyframerequestevent-keyframerequestevent-type-rid-rid"><code><c- g>rid</c-></code></a>);
+  <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>? <a data-readonly data-type="DOMString?" href="#dom-keyframerequestevent-rid"><code><c- g>rid</c-></code></a>;
+};
+
 <c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="https://w3c.github.io/webrtc-pc/#dom-rtcrtpsender"><c- g>RTCRtpSender</c-></a> {
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpsender-generatekeyframe"><c- g>generateKeyFrame</c-></a>(<c- b>optional</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a> &lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>> <a href="#dom-rtcrtpsender-generatekeyframe-rids-rids"><code><c- g>rids</c-></code></a>);
 };
@@ -2343,21 +2421,23 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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@@ -2383,16 +2463,16 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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+window.dfnpanelData['dom-keyframerequestevent-rid'] = {"dfnID": "dom-keyframerequestevent-rid", "url": "#dom-keyframerequestevent-rid", "dfnText": "rid", "refSections": [{"refs": [{"id": "ref-for-dom-keyframerequestevent-rid"}], "title": "4.9. Events"}], "external": false};
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+window.dfnpanelData['abstract-opdef-generate-key-frame-algorithm'] = {"dfnID": "abstract-opdef-generate-key-frame-algorithm", "url": "#abstract-opdef-generate-key-frame-algorithm", "dfnText": "generate key frame algorithm", "refSections": [{"refs": [{"id": "ref-for-abstract-opdef-generate-key-frame-algorithm"}], "title": "4.7. Operations"}, {"refs": [{"id": "ref-for-abstract-opdef-generate-key-frame-algorithm\u2460"}], "title": "4.9. Events"}, {"refs": [{"id": "ref-for-abstract-opdef-generate-key-frame-algorithm\u2461"}], "title": "5.1. Extension operation"}], "external": false};
 window.dfnpanelData['abstract-opdef-send-request-key-frame-algorithm'] = {"dfnID": "abstract-opdef-send-request-key-frame-algorithm", "url": "#abstract-opdef-send-request-key-frame-algorithm", "dfnText": "send request key frame algorithm", "refSections": [{"refs": [{"id": "ref-for-abstract-opdef-send-request-key-frame-algorithm"}], "title": "4.7. Operations"}], "external": false};
 window.dfnpanelData['dom-rtcrtpsender-generatekeyframe'] = {"dfnID": "dom-rtcrtpsender-generatekeyframe", "url": "#dom-rtcrtpsender-generatekeyframe", "dfnText": "generateKeyFrame(rids)", "refSections": [{"refs": [{"id": "ref-for-dom-rtcrtpsender-generatekeyframe"}], "title": "5. RTCRtpSender extension"}], "external": false};
 </script>