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Add <meta name="responsive-embedded-sizing"> #12444

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Original file line number Diff line number Diff line change
Expand Up @@ -3979,6 +3979,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li><dfn data-x-href="https://drafts.csswg.org/css-sizing/#fit-content-inline-size">fit-content inline size</dfn></li>
<li><dfn data-x-href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">'aspect-ratio'</dfn> property</li>
<li><dfn data-x-href="https://drafts.csswg.org/css-sizing/#intrinsic-size">intrinsic size</dfn></li>
<li><dfn data-x-href="https://drafts.csswg.org/css-sizing/#document-responsive-embedded-sizing-flag">responsive embedded sizing flag</dfn></li>
</ul>

<p>The following features are defined in <cite>CSS Lists and Counters</cite>.
Expand Down Expand Up @@ -11497,6 +11498,10 @@ partial interface <dfn id="document" data-lt="">Document</dfn> {
navigation ID for WebDriver BiDi</dfn>, which is a <span>navigation ID</span> or null, initially
null.</p>

<p>Each <code>Document</code> has a
<dfn data-x="concept-document-responsive-embedded-sizing-flag">responsive embedded sizing flag</dfn>,
which is a boolean, initially false.</p>

<p class="note">As the name indicates, this is used for interfacing with the <cite>WebDriver
BiDi</cite> specification, which needs to be informed about certain occurrences during the early
parts of the <code>Document</code>'s lifecycle, in a way that ties them to the original
Expand Down Expand Up @@ -17901,6 +17906,23 @@ interface <dfn interface>HTMLMetaElement</dfn> : <span>HTMLElement</span> {
</div>
</dd>

<dt><dfn attr-value for="meta/name"><code data-x="meta-responsive-embedded-sizing">responsive-embedded-sizing</code></dfn></dt>

<dd>
<div algorithm>
<p>If a <code>meta</code> element <var>element</var> is
<span data-x="node is inserted into a document">inserted into the document</span>,
the user agent must run the following algorithm:</p>

<ol>
<li><p>If <var>element</var> is not inserted by the parser, then return.</p></li>
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@annevk annevk May 18, 2026

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This doesn't seem like a good idea. This will just encourage people to use document.write() instead of tree manipulation.

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@noamr noamr May 21, 2026

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Suggesting an alternative where once the body element is seen this cannot be modified.

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@annevk annevk May 22, 2026

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That's also not a primitive that exists?

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@noamr noamr May 22, 2026

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It is, eg for render blocking.

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@noamr noamr May 22, 2026

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A similar approach is to cement it at the beginning of the first render


<li><p>Set the <span>responsive embedded sizing flag</span>
of the <code>Document</code>.<p></li>
</ol>
</div>
</dd>

<dt><dfn attr-value for="meta/name"><code data-x="meta-theme-color">theme-color</code></dfn></dt>

<dd>
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