From 4521269f886856214ffd05ce02d219a386442dbf Mon Sep 17 00:00:00 2001
From: youennf <youennf@users.noreply.github.com>
Date: Fri, 31 May 2024 06:48:46 +0000
Subject: [PATCH] Add screenshare support (#319)

SHA: ceaac1607e37c1fe216028b07dbf130fa3ff41f4
Reason: push, by youennf

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 57 ++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 40 insertions(+), 17 deletions(-)

diff --git a/index.html b/index.html
index 4dd378f..569a68d 100644
--- a/index.html
+++ b/index.html
@@ -7,7 +7,7 @@
   <link href="https://www.w3.org/StyleSheets/TR/2021/W3C-ED" rel="stylesheet">
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://www.w3.org/TR/mediasession/" rel="canonical">
-  <meta content="210966333cf939c0e1db37c633a0e95267f9a9e8" name="document-revision">
+  <meta content="ceaac1607e37c1fe216028b07dbf130fa3ff41f4" name="document-revision">
 <style>
   /* https://github.com/tabatkins/bikeshed/issues/485 */
   .example .self-link { display: none; }
@@ -956,6 +956,8 @@ <h3 class="heading settled" data-level="3.4" id="actions-model"><span class="sec
           action’s intent is to mute or unmute the user’s microphone. 
       <li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;togglecamera&quot;|togglecamera" id="dom-mediasessionaction-togglecamera"><code>togglecamera</code></dfn>: the
           action’s intent is to turn the user’s active camera on or off. 
+      <li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;togglescreenshare&quot;|togglescreenshare" id="dom-mediasessionaction-togglescreenshare"><code>togglescreenshare</code></dfn>: the action’s intent
+          is to turn the user’s active screenshare on or off. 
       <li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;hangup&quot;|hangup" id="dom-mediasessionaction-hangup"><code>hangup</code></dfn>: the action’s
           intent is to end a call. 
       <li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;previousslide&quot;|previousslide" id="dom-mediasessionaction-previousslide"><code>previousslide</code></dfn>: the
@@ -1012,10 +1014,10 @@ <h3 class="heading settled" data-level="3.4" id="actions-model"><span class="sec
      <p></p>
      <p> It is RECOMMENDED for user agents to implement a default handler for the <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-play" id="ref-for-dom-mediasessionaction-play④">play</a> and <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-pause" id="ref-for-dom-mediasessionaction-pause⑤">pause</a> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑦">media session actions</a> if none was
       provided for the <a data-link-type="dfn" href="#active-media-session" id="ref-for-active-media-session①⑨">active media session</a>. </p>
-     <p> A user agent MAY implement a default handler for the <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone">togglemicrophone</a>, <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera">togglecamera</a>, or <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup">hangup</a> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑧">media session actions</a> if none was
+     <p> A user agent MAY implement a default handler for the <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone">togglemicrophone</a>, <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera">togglecamera</a>, or <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglescreenshare" id="ref-for-dom-mediasessionaction-togglescreenshare">togglescreenshare</a>, or <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup">hangup</a> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑧">media session actions</a> if none was
       provided for the <a data-link-type="dfn" href="#active-media-session" id="ref-for-active-media-session②⓪">active media session</a>. </p>
-     <p> A user agent MAY expose microphone and camera state to web pages via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack">MediaStreamTrack</a></code>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack-muted" id="ref-for-dom-mediastreamtrack-muted">muted</a></code> attribute in addition
-      to <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone①">togglemicrophone</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera①">togglecamera</a></code> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑨">media session action</a>. In that
+     <p> A user agent MAY expose microphone, camera, and screenshare state to web pages
+      via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack">MediaStreamTrack</a></code>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack-muted" id="ref-for-dom-mediastreamtrack-muted">muted</a></code> attribute in addition to <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone①">togglemicrophone</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera①">togglecamera</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglescreenshare" id="ref-for-dom-mediasessionaction-togglescreenshare①">togglescreenshare</a></code> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑨">media session action</a>. In that
       case, the user agent MUST execute the corresponding <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler②">MediaSessionActionHandler</a></code> before running, as different tasks, the
       steps defined to <a data-link-type="abstract-op" href="https://w3c.github.io/mediacapture-main/#set-track-muted" id="ref-for-set-track-muted">set a track’s muted state</a>. </p>
      <p class="note" role="note"> A page should only register a <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler③">MediaSessionActionHandler</a></code> for a <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①⓪">media
@@ -1114,6 +1116,7 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-seekto" id="ref-for-dom-mediasessionaction-seekto"><c- s>"seekto"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone②"><c- s>"togglemicrophone"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera②"><c- s>"togglecamera"</c-></a>,
+  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglescreenshare" id="ref-for-dom-mediasessionaction-togglescreenshare②"><c- s>"togglescreenshare"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup①"><c- s>"hangup"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-previousslide" id="ref-for-dom-mediasessionaction-previousslide"><c- s>"previousslide"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-nextslide" id="ref-for-dom-mediasessionaction-nextslide"><c- s>"nextslide"</c-></a>,
@@ -1135,6 +1138,8 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise"><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-undefined③"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-mediasession-setmicrophoneactive" id="ref-for-dom-mediasession-setmicrophoneactive"><c- g>setMicrophoneActive</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSession/setMicrophoneActive(active)" data-dfn-type="argument" data-export id="dom-mediasession-setmicrophoneactive-active-active"><code><c- g>active</c-></code><a class="self-link" href="#dom-mediasession-setmicrophoneactive-active-active"></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-undefined" id="ref-for-idl-undefined④"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-mediasession-setcameraactive" id="ref-for-dom-mediasession-setcameraactive"><c- g>setCameraActive</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSession/setCameraActive(active)" data-dfn-type="argument" data-export id="dom-mediasession-setcameraactive-active-active"><code><c- g>active</c-></code><a class="self-link" href="#dom-mediasession-setcameraactive-active-active"></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-undefined⑤"><c- b>undefined</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-mediasession-setscreenshareactive" id="ref-for-dom-mediasession-setscreenshareactive"><c- g>setScreenshareActive</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSession/setScreenshareActive(active)" data-dfn-type="argument" data-export id="dom-mediasession-setscreenshareactive-active-active"><code><c- g>active</c-></code><a class="self-link" href="#dom-mediasession-setscreenshareactive-active-active"></a></dfn>);
 };
 </pre>
    <p> A <code class="idl"><a data-link-type="idl" href="#mediasession" id="ref-for-mediasession①⓪">MediaSession</a></code> object represents a media session for a given document and
@@ -1205,6 +1210,14 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
     <li> Return the result of running the <a data-link-type="dfn" href="#update-capture-state-algorithm" id="ref-for-update-capture-state-algorithm①">update capture state algorithm</a> with <var>document</var>, <var>active</var> and <var>captureKind</var>. 
    </ol>
    <p></p>
+   <p> Similarly, the <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSession" data-dfn-type="method" data-export id="dom-mediasession-setscreenshareactive"><code>setScreenshareActive(active)</code></dfn> method indicates to the user agent the screenshare capture state desired by the page.
+  When invoked, it MUST perform the following steps: </p>
+   <ol>
+    <li> Let <var>document</var> be <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②">this</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global②">relevant global object</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-document-window" id="ref-for-concept-document-window②">associated Document</a>. 
+    <li> Let <var>captureKind</var> be "screenshare". 
+    <li> Return the result of running the <a data-link-type="dfn" href="#update-capture-state-algorithm" id="ref-for-update-capture-state-algorithm②">update capture state algorithm</a> with <var>document</var>, <var>active</var> and <var>captureKind</var>. 
+   </ol>
+   <p></p>
    <p> The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="update-capture-state-algorithm">update capture state algorithm</dfn>, when invoked with <var>document</var>, <var>active</var> and <var>captureKind</var>, MUST
   perform the following steps: </p>
    <ol>
@@ -1243,9 +1256,10 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
     <li> Return <var>p</var>. 
    </ol>
    <p></p>
-   <p class="note" role="note"> Both the <a data-link-type="functionish" href="#dom-mediasession-setmicrophoneactive" id="ref-for-dom-mediasession-setmicrophoneactive①">setMicrophoneActive(active)</a> and <a data-link-type="functionish" href="#dom-mediasession-setcameraactive" id="ref-for-dom-mediasession-setcameraactive①">setCameraActive(active)</a> methods can reject based on user agent specific heuristics. This might in
-  particular happen when the web page asks to activate (aka unmute) microphone
-  or camera. The user agent could decide to require <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/interaction.html#transient-activation" id="ref-for-transient-activation">transient activation</a> in
+   <p class="note" role="note"> The <a data-link-type="functionish" href="#dom-mediasession-setmicrophoneactive" id="ref-for-dom-mediasession-setmicrophoneactive①">setMicrophoneActive(active)</a>, <a data-link-type="functionish" href="#dom-mediasession-setcameraactive" id="ref-for-dom-mediasession-setcameraactive①">setCameraActive(active)</a> and <a data-link-type="functionish" href="#dom-mediasession-setscreenshareactive" id="ref-for-dom-mediasession-setscreenshareactive①">setScreenshareActive(active)</a> methods
+  can reject based on user agent specific heuristics. This might in
+  particular happen when the web page asks to activate (unmute) the microphone,
+  camera or screenshare. The user agent could decide to require <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/interaction.html#transient-activation" id="ref-for-transient-activation">transient activation</a> in
   that case. It might also require user input through a prompt to make the
   actual decision. </p>
    <p> The user agent MAY display UI which invokes handlers for <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①②">media session actions</a>. </p>
@@ -1468,11 +1482,11 @@ <h2 class="heading settled" data-level="9" id="the-mediasessionactiondetails-dic
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-mediasessionseektoactiondetails"><code><c- g>MediaSessionSeekToActionDetails</c-></code></dfn> : <a data-link-type="idl-name" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails④"><c- n>MediaSessionActionDetails</c-></a> {
   <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-double" id="ref-for-idl-double⑤"><c- b>double</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="double " href="#dom-mediasessionseektoactiondetails-seektime" id="ref-for-dom-mediasessionseektoactiondetails-seektime"><c- g>seekTime</c-></a>;
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSessionSeekToActionDetails" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-mediasessionseektoactiondetails-fastseek"><code><c- g>fastSeek</c-></code><a class="self-link" href="#dom-mediasessionseektoactiondetails-fastseek"></a></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSessionSeekToActionDetails" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-mediasessionseektoactiondetails-fastseek"><code><c- g>fastSeek</c-></code><a class="self-link" href="#dom-mediasessionseektoactiondetails-fastseek"></a></dfn>;
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-mediasessioncaptureactiondetails"><code><c- g>MediaSessionCaptureActionDetails</c-></code></dfn> : <a data-link-type="idl-name" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails⑤"><c- n>MediaSessionActionDetails</c-></a> {
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSessionCaptureActionDetails" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-mediasessioncaptureactiondetails-isactivating"><code><c- g>isActivating</c-></code><a class="self-link" href="#dom-mediasessioncaptureactiondetails-isactivating"></a></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean④"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="MediaSessionCaptureActionDetails" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-mediasessioncaptureactiondetails-isactivating"><code><c- g>isActivating</c-></code><a class="self-link" href="#dom-mediasessioncaptureactiondetails-isactivating"></a></dfn>;
 };
 
 </pre>
@@ -1489,6 +1503,7 @@ <h2 class="heading settled" data-level="9" id="the-mediasessionactiondetails-dic
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionseektoactiondetails" id="ref-for-dictdef-mediasessionseektoactiondetails">MediaSessionSeekToActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-seekto" id="ref-for-dom-mediasessionaction-seekto①">seekto</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessioncaptureactiondetails" id="ref-for-dictdef-mediasessioncaptureactiondetails">MediaSessionCaptureActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone③">togglemicrophone</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessioncaptureactiondetails" id="ref-for-dictdef-mediasessioncaptureactiondetails①">MediaSessionCaptureActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera③">togglecamera</a></code>.
+    <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessioncaptureactiondetails" id="ref-for-dictdef-mediasessioncaptureactiondetails②">MediaSessionCaptureActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglescreenshare" id="ref-for-dom-mediasessionaction-togglescreenshare③">togglescreenshare</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①②">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup②">hangup</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①③">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-previousslide" id="ref-for-dom-mediasessionaction-previousslide①">previousslide</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①④">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-nextslide" id="ref-for-dom-mediasessionaction-nextslide①">nextslide</a></code>.
@@ -1951,6 +1966,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dom-mediasession-setmicrophoneactive">setMicrophoneActive(active)</a><span>, in § 4</span>
    <li><a href="#dom-mediasession-setpositionstate">setPositionState()</a><span>, in § 4</span>
    <li><a href="#dom-mediasession-setpositionstate">setPositionState(state)</a><span>, in § 4</span>
+   <li><a href="#dom-mediasession-setscreenshareactive">setScreenshareActive(active)</a><span>, in § 4</span>
    <li><a href="#dom-mediaimage-sizes">sizes</a><span>, in § 7</span>
    <li><a href="#dom-mediasessionaction-skipad">"skipad"</a><span>, in § 3.4</span>
    <li><a href="#dom-mediasessionaction-skipad">skipad</a><span>, in § 3.4</span>
@@ -1981,6 +1997,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dom-mediasessionaction-togglecamera">togglecamera</a><span>, in § 3.4</span>
    <li><a href="#dom-mediasessionaction-togglemicrophone">"togglemicrophone"</a><span>, in § 3.4</span>
    <li><a href="#dom-mediasessionaction-togglemicrophone">togglemicrophone</a><span>, in § 3.4</span>
+   <li><a href="#dom-mediasessionaction-togglescreenshare">"togglescreenshare"</a><span>, in § 3.4</span>
+   <li><a href="#dom-mediasessionaction-togglescreenshare">togglescreenshare</a><span>, in § 3.4</span>
    <li><a href="#dom-mediaimage-type">type</a><span>, in § 7</span>
    <li><a href="#update-action-handler-algorithm">update action handler algorithm</a><span>, in § 3.4</span>
    <li><a href="#update-capture-state-algorithm">update capture state algorithm</a><span>, in § 4</span>
@@ -2139,6 +2157,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-seekto"><c- s>"seekto"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone"><c- s>"togglemicrophone"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera"><c- s>"togglecamera"</c-></a>,
+  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglescreenshare"><c- s>"togglescreenshare"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup"><c- s>"hangup"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-previousslide"><c- s>"previousslide"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-nextslide"><c- s>"nextslide"</c-></a>,
@@ -2160,6 +2179,8 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   <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-mediasession-setmicrophoneactive"><c- g>setMicrophoneActive</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a href="#dom-mediasession-setmicrophoneactive-active-active"><code><c- g>active</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-mediasession-setcameraactive"><c- g>setCameraActive</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a href="#dom-mediasession-setcameraactive-active-active"><code><c- g>active</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-mediasession-setscreenshareactive"><c- g>setScreenshareActive</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a href="#dom-mediasession-setscreenshareactive-active-active"><code><c- g>active</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>Window</c->]
@@ -2540,7 +2561,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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@@ -2554,7 +2575,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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+window.dfnpanelData['e99bd18e'] = {"dfnID": "e99bd18e", "url": "https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global", "dfnText": "relevant global object", "refSections": [{"refs": [{"id": "ref-for-concept-relevant-global"}, {"id": "ref-for-concept-relevant-global\u2460"}, {"id": "ref-for-concept-relevant-global\u2461"}], "title": "4. The MediaSession interface"}], "external": true};
 window.dfnpanelData['d75a73db'] = {"dfnID": "d75a73db", "url": "https://html.spec.whatwg.org/multipage/semantics.html#dom-link-sizes", "dfnText": "sizes (for HTMLLinkElement)", "refSections": [{"refs": [{"id": "ref-for-dom-link-sizes"}], "title": "7. The MediaImage dictionary"}], "external": true};
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@@ -2577,18 +2598,18 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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@@ -2611,6 +2632,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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+window.dfnpanelData['dom-mediasessionaction-togglescreenshare'] = {"dfnID": "dom-mediasessionaction-togglescreenshare", "url": "#dom-mediasessionaction-togglescreenshare", "dfnText": "togglescreenshare", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionaction-togglescreenshare"}, {"id": "ref-for-dom-mediasessionaction-togglescreenshare\u2460"}], "title": "3.4. Actions"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-togglescreenshare\u2461"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-togglescreenshare\u2462"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dom-mediasessionaction-hangup'] = {"dfnID": "dom-mediasessionaction-hangup", "url": "#dom-mediasessionaction-hangup", "dfnText": "hangup", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionaction-hangup"}], "title": "3.4. Actions"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-hangup\u2460"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-hangup\u2461"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dom-mediasessionaction-previousslide'] = {"dfnID": "dom-mediasessionaction-previousslide", "url": "#dom-mediasessionaction-previousslide", "dfnText": "previousslide", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionaction-previousslide"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-previousslide\u2460"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dom-mediasessionaction-nextslide'] = {"dfnID": "dom-mediasessionaction-nextslide", "url": "#dom-mediasessionaction-nextslide", "dfnText": "nextslide", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionaction-nextslide"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-nextslide\u2460"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
@@ -2642,7 +2664,8 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 window.dfnpanelData['dom-mediasession-setpositionstate'] = {"dfnID": "dom-mediasession-setpositionstate", "url": "#dom-mediasession-setpositionstate", "dfnText": "setPositionState(state)", "refSections": [{"refs": [{"id": "ref-for-dom-mediasession-setpositionstate"}], "title": "4. The MediaSession interface"}], "external": false};
 window.dfnpanelData['dom-mediasession-setmicrophoneactive'] = {"dfnID": "dom-mediasession-setmicrophoneactive", "url": "#dom-mediasession-setmicrophoneactive", "dfnText": "setMicrophoneActive(active)", "refSections": [{"refs": [{"id": "ref-for-dom-mediasession-setmicrophoneactive"}, {"id": "ref-for-dom-mediasession-setmicrophoneactive\u2460"}], "title": "4. The MediaSession interface"}], "external": false};
 window.dfnpanelData['dom-mediasession-setcameraactive'] = {"dfnID": "dom-mediasession-setcameraactive", "url": "#dom-mediasession-setcameraactive", "dfnText": "setCameraActive(active)", "refSections": [{"refs": [{"id": "ref-for-dom-mediasession-setcameraactive"}, {"id": "ref-for-dom-mediasession-setcameraactive\u2460"}], "title": "4. The MediaSession interface"}], "external": false};
-window.dfnpanelData['update-capture-state-algorithm'] = {"dfnID": "update-capture-state-algorithm", "url": "#update-capture-state-algorithm", "dfnText": "update capture state algorithm", "refSections": [{"refs": [{"id": "ref-for-update-capture-state-algorithm"}, {"id": "ref-for-update-capture-state-algorithm\u2460"}], "title": "4. The MediaSession interface"}], "external": false};
+window.dfnpanelData['dom-mediasession-setscreenshareactive'] = {"dfnID": "dom-mediasession-setscreenshareactive", "url": "#dom-mediasession-setscreenshareactive", "dfnText": "setScreenshareActive(active)", "refSections": [{"refs": [{"id": "ref-for-dom-mediasession-setscreenshareactive"}, {"id": "ref-for-dom-mediasession-setscreenshareactive\u2460"}], "title": "4. The MediaSession interface"}], "external": false};
+window.dfnpanelData['update-capture-state-algorithm'] = {"dfnID": "update-capture-state-algorithm", "url": "#update-capture-state-algorithm", "dfnText": "update capture state algorithm", "refSections": [{"refs": [{"id": "ref-for-update-capture-state-algorithm"}, {"id": "ref-for-update-capture-state-algorithm\u2460"}, {"id": "ref-for-update-capture-state-algorithm\u2461"}], "title": "4. The MediaSession interface"}], "external": false};
 window.dfnpanelData['pausing-all-input-sources'] = {"dfnID": "pausing-all-input-sources", "url": "#pausing-all-input-sources", "dfnText": "pausing all input sources", "refSections": [{"refs": [{"id": "ref-for-pausing-all-input-sources"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-pausing-all-input-sources\u2460"}, {"id": "ref-for-pausing-all-input-sources\u2461"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['mediametadata'] = {"dfnID": "mediametadata", "url": "#mediametadata", "dfnText": "MediaMetadata", "refSections": [{"refs": [{"id": "ref-for-mediametadata"}, {"id": "ref-for-mediametadata\u2460"}, {"id": "ref-for-mediametadata\u2461"}, {"id": "ref-for-mediametadata\u2462"}, {"id": "ref-for-mediametadata\u2463"}], "title": "2.1. User interface guidelines"}, {"refs": [{"id": "ref-for-mediametadata\u2464"}], "title": "2.2. Incognito mode"}, {"refs": [{"id": "ref-for-mediametadata\u2465"}, {"id": "ref-for-mediametadata\u2466"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-mediametadata\u2467"}, {"id": "ref-for-mediametadata\u2468"}, {"id": "ref-for-mediametadata\u2460\u24ea"}, {"id": "ref-for-mediametadata\u2460\u2460"}, {"id": "ref-for-mediametadata\u2460\u2461"}, {"id": "ref-for-mediametadata\u2460\u2462"}, {"id": "ref-for-mediametadata\u2460\u2463"}, {"id": "ref-for-mediametadata\u2460\u2464"}, {"id": "ref-for-mediametadata\u2460\u2465"}, {"id": "ref-for-mediametadata\u2460\u2466"}, {"id": "ref-for-mediametadata\u2460\u2467"}, {"id": "ref-for-mediametadata\u2460\u2468"}, {"id": "ref-for-mediametadata\u2461\u24ea"}, {"id": "ref-for-mediametadata\u2461\u2460"}, {"id": "ref-for-mediametadata\u2461\u2461"}, {"id": "ref-for-mediametadata\u2461\u2462"}, {"id": "ref-for-mediametadata\u2461\u2463"}, {"id": "ref-for-mediametadata\u2461\u2464"}, {"id": "ref-for-mediametadata\u2461\u2465"}, {"id": "ref-for-mediametadata\u2461\u2466"}, {"id": "ref-for-mediametadata\u2461\u2467"}], "title": "5. The MediaMetadata interface"}], "external": false};
 window.dfnpanelData['dom-mediametadata-chapterinfo'] = {"dfnID": "dom-mediametadata-chapterinfo", "url": "#dom-mediametadata-chapterinfo", "dfnText": "chapterInfo", "refSections": [{"refs": [{"id": "ref-for-dom-mediametadata-chapterinfo"}], "title": "11. Examples"}], "external": false};
@@ -2688,7 +2711,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 window.dfnpanelData['dictdef-mediasessionactiondetails'] = {"dfnID": "dictdef-mediasessionactiondetails", "url": "#dictdef-mediasessionactiondetails", "dfnText": "MediaSessionActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails"}], "title": "3.4. Actions"}, {"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails\u2460"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails\u2461"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2462"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2463"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2464"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2465"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2466"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2467"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2468"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u24ea"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2460"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2461"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2462"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2463"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2464"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dictdef-mediasessionseekactiondetails'] = {"dfnID": "dictdef-mediasessionseekactiondetails", "url": "#dictdef-mediasessionseekactiondetails", "dfnText": "MediaSessionSeekActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionseekactiondetails"}, {"id": "ref-for-dictdef-mediasessionseekactiondetails\u2460"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dictdef-mediasessionseektoactiondetails'] = {"dfnID": "dictdef-mediasessionseektoactiondetails", "url": "#dictdef-mediasessionseektoactiondetails", "dfnText": "MediaSessionSeekToActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionseektoactiondetails"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
-window.dfnpanelData['dictdef-mediasessioncaptureactiondetails'] = {"dfnID": "dictdef-mediasessioncaptureactiondetails", "url": "#dictdef-mediasessioncaptureactiondetails", "dfnText": "MediaSessionCaptureActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessioncaptureactiondetails"}, {"id": "ref-for-dictdef-mediasessioncaptureactiondetails\u2460"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
+window.dfnpanelData['dictdef-mediasessioncaptureactiondetails'] = {"dfnID": "dictdef-mediasessioncaptureactiondetails", "url": "#dictdef-mediasessioncaptureactiondetails", "dfnText": "MediaSessionCaptureActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessioncaptureactiondetails"}, {"id": "ref-for-dictdef-mediasessioncaptureactiondetails\u2460"}, {"id": "ref-for-dictdef-mediasessioncaptureactiondetails\u2461"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dom-mediasessionactiondetails-action'] = {"dfnID": "dom-mediasessionactiondetails-action", "url": "#dom-mediasessionactiondetails-action", "dfnText": "action", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionactiondetails-action"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dom-mediasessionseekactiondetails-seekoffset'] = {"dfnID": "dom-mediasessionseekactiondetails-seekoffset", "url": "#dom-mediasessionseekactiondetails-seekoffset", "dfnText": "seekOffset", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionseekactiondetails-seekoffset"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dom-mediasessionseektoactiondetails-seektime'] = {"dfnID": "dom-mediasessionseektoactiondetails-seektime", "url": "#dom-mediasessionseektoactiondetails-seektime", "dfnText": "seekTime", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionseektoactiondetails-seektime"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};