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Update SOTD to highlight substantive changes since REC
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See discussion in #294.

This updates the Status of this Document section in preparation to publication
as First Public Working Draft, highlighting substantive changes made to the spec
and pointing people at the list of commits for details.
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tidoust committed Sep 6, 2021
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<body data-cite="html dom url">

<section id="sotd">
<p>On top of editorial updates, substantives changes since publication as a W3C Recommendation in <a href="https://www.w3.org/TR/2016/REC-media-source-20161117/">November 2016</a> are the addition of a {{SourceBuffer/changeType()}} method to switch codecs, the possibility to create and use {{MediaSource}} objects off the main thread in dedicated workers, and the removal of the <code>createObjectURL()</code> extension to the {{URL}} object following its integration in the File API [[FILEAPI]]. For a full list of changes done since the previous version, see the <a href="https://github.com/w3c/media-source/commits/main">commits</a>.</p>

<p>The working group maintains <a href="https://github.com/w3c/media-source/issues">a list of all bug reports that the editors have not yet tried to address</a>.</p>
<p>Implementors should be aware that this specification is not stable. <strong>Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways.</strong> Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should track the <a href="https://github.com/w3c/media-source">GitHub repository</a> and take part in the discussions.</p>
</section>
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<dt><dfn id="mediasource-object-url">MediaSource object URL</dfn></dt>
<dd>
<p>A MediaSource object URL is a unique <a def-id="blob-uri"></a> [[FILE-API]] created by {{URL/createObjectURL()}}. It is used to attach a <a>MediaSource</a> object to an HTMLMediaElement.</p>
<p>A MediaSource object URL is a unique <a def-id="blob-uri"></a> [[FILEAPI]] created by {{URL/createObjectURL()}}. It is used to attach a <a>MediaSource</a> object to an HTMLMediaElement.</p>
<p>These URLs are the same as a <a def-id="blob-uri"></a>, except that anything in the definition of that feature that refers to <a def-id="File"></a> and <a def-id="Blob"></a> objects is hereby extended to also apply to <a>MediaSource</a> objects.</p>
<p>The [=origin=] of the MediaSource object URL is the [=relevant settings object=] of <code>this</code> during the call to {{URL/createObjectURL()}}.</p>
<p class="note">For example, the [=origin=] of the MediaSource object URL affects the way that the media element is <a href="https://html.spec.whatwg.org/multipage/canvas.html#security-with-canvas-elements">consumed by canvas</a>.</p>
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