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Merged
otherdaniel merged 1 commit into from
Apr 9, 2026
Merged

Update usermedia-element-delta spec. #104

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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,8 @@ A set of HTML elements to mediate access to a [MediaStream](https://www.w3.org/T
# Page Embedded Permission Control (PEPC)

The originally proposed permission element, for any
[permission](https://www.w3.org/TR/permissions/)
[permission](https://www.w3.org/TR/permissions/). This proposal is no longer
pursued.

* [Explainer for PEPC](explainer.md)
* [Permission Element Specification draft](https://wicg.github.io/PEPC/permission-element.html)
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73 changes: 50 additions & 23 deletions usermedia-element-delta.html
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Expand Up @@ -14,8 +14,8 @@
editors: [{name: "Daniel Vogelheim", company: "Google LLC"}],
specStatus: "UD",
shortName: "proposed-usermedia-html-elements",
edDraftURI: "https://wicg.github.io/PEPC/usermedia-elements.html",
canonicalURI: "edDraft",
edDraftURI: "https://wicg.github.io/PEPC/usermedia-element-delta.html",
latestVersion: null,
noRecTrack: true,
localBiblio: {
"mediacapture-extensions": {
Expand Down Expand Up @@ -250,9 +250,14 @@ <h3>Algorithms</h3>
<ol class=algorithm>
<li>If |element|.{{ActivationBlockersMixin/isValid}} is false,
then return.</li>
<li>If {{HTMLUserMediaElement/[[stream]]}} is null, run
<li>If {{HTMLUserMediaElement/[[stream]]}} is null, run the
[=HTMLUserMediaElement/activation initial=] steps.</li>
<li>Otherwise, run [=HTMLUserMediaElement/activation second=] steps.</li>
<li>Otherwise, if
{{HTMLUserMediaElement/[[stream]]}}.{{MediaStream/active}}
is false, run the [=HTMLUserMediaElement/activation inactive=]
steps.</li>
<li>Otherwise, run the [=HTMLUserMediaElement/activation active=]
steps.</li>
</ol>

<p>The <dfn for=HTMLUserMediaElement>activation initial</dfn> steps
Expand Down Expand Up @@ -297,34 +302,56 @@ <h3>Algorithms</h3>
</li>
</ol>

<p>The <dfn for=HTMLUserMediaElement>activation second</dfn> steps
<p>The <dfn for=HTMLUserMediaElement>activation inactive</dfn> steps
are:</p>
<ol class=algorithm>
<li>[=Assert=]: |element|.{{ActivationBlockersMixin/isValid}}.</li>
<li>[=Assert=]: {{HTMLUserMediaElement/[[stream]]}} is a
{{MediaStream}}.</li>
<li>TODO: We ought to do something here, too.
<li>[=Assert=]: {{HTMLUserMediaElement/[[stream]]}}.{{MediaStream/active}}
is false.</li>
<li>[=list/iterate|For each=] {{MediaStreamTrack}} |track| of
{{HTMLUserMediaElement/[[stream]]}}'s [=track set=]:
<ol>
<li>Set |track|.{{MediaStreamTrack/enabled}} to true.
</ol>
</li>
</ol>

<p>The <dfn for=HTMLUserMediaElement>activation active</dfn> steps
are:</p>
<ol class=algorithm>
<li>[=Assert=]: |element|.{{ActivationBlockersMixin/isValid}}.</li>
<li>[=Assert=]: {{HTMLUserMediaElement/[[stream]]}} is a
{{MediaStream}}.</li>
<li>[=Assert=]: {{HTMLUserMediaElement/[[stream]]}}.{{MediaStream/active}}
is true.</li>
<li>Let |muted| be false.</li>
<li>[=list/iterate|For each=] {{MediaStreamTrack}} |track| of
{{HTMLUserMediaElement/[[stream]]}}'s [=track set=]:
<ol>
<li>If |track|.{{MediaStreamTrack/muted}}, set |muted| to true.
</ol>
</li>
<li>[=list/iterate|For each=] {{MediaStreamTrack}} |track| of
{{HTMLUserMediaElement/[[stream]]}}'s [=track set=]:
<ol>
<li>Set |track|.{{MediaStreamTrack/muted}} to &not;|muted|.
</ol>
</li>
</ol>

<p>The <dfn for=HTMLUserMediaElement>constraint filter</dfn> steps
for an |element| and {{MediaStreamConstraints}} |constraints| are:</p>
<ol class=algorithm>
<li>Let |result| be a new [=dictionary=].
<li>If |element| is a {{HTMLUserMediaElement}},
set |result| to &laquo;[
{{MediaStreamConstraints/audio}} &rarr; |constraints|[{{MediaStreamConstraints/audio}}],
{{MediaStreamConstraints/video}} &rarr; |constraints|[{{MediaStreamConstraints/video}}]
]&raquo;.</li>
<li>Otherwise, if |element| is a {{HTMLMicrophoneElement}},
set |result| to &laquo;[
{{MediaStreamConstraints/audio}} &rarr; |constraints|[{{MediaStreamConstraints/audio}}],
{{MediaStreamConstraints/video}} &rarr; false
]&raquo;.</li>
<li>Otherwise, if |element| is a {{HTMLCameraElement}},
set |result| to &laquo;[
{{MediaStreamConstraints/audio}} &rarr; false,
{{MediaStreamConstraints/video}} &rarr; |constraints|[{{MediaStreamConstraints/video}}]
]&raquo;.</li>
<li>Let |result| be a new [=dictionary=].</li>
<li>Let |defaults| be |element|'s [=default constraints=].</li>
<li>For |key| of &laquo; {{MediaStreamConstraints/audio}}, {{MediaStreamConstraints/video}} &raquo;:
<ol>
<li>If |defaults|[|key|] is true, then set |result|[|key|] to |constraints|[|key|].</li>
<li>Otherwise, set |result|[|key|] to false.</li>
</ol>
</li>
<li>TODO: |results| should have additional filtering to support a
reasonable, easy-to-use subset of all the constraints allowed for
the getUserMedia call.</li>
Expand Down Expand Up @@ -360,7 +387,7 @@ <h3>&lt;usermedia&gt; legacy support.</h3>
<dt>`"video audio"`</dt>
<dd>&mdash; behaves like a regular &lt;<a>usermedia</a>&gt; element.</dd>
<dt>`"audio"`</dt>
<dd>&mdash; behaves like an &lt;<a>microphone</a>&gt; element.</dd>
<dd>&mdash; behaves like a &lt;<a>microphone</a>&gt; element.</dd>
<dt>`"video"`</dt>
<dd>&mdash; behaves like a &lt;<a>camera</a>&gt; element.</dd>
<dt>all other values</dt>
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