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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-4/#responsive-iframes">responsively-sized iframes</dfn></li>
</ul>

<p>The following features are defined in <cite>CSS Lists and Counters</cite>.
Expand Down Expand Up @@ -11504,6 +11505,15 @@ partial interface <dfn id="document" data-lt="">Document</dfn> {
the <span>ongoing navigation</span>. This eventually gets set back to null, after <cite>WebDriver
BiDi</cite> considers the loading process to be finished. <ref>BIDI</ref></p>

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

<p class="note">This is set by <code>meta</code> elements whose
<code data-x="attr-meta-name">name</code> attribute is
<code data-x="meta-responsive-embedded-sizing">responsive-embedded-sizing</code>,
and used by <span>responsively-sized iframes</span>.</p>

<p>Each <code>Document</code> has an <dfn data-x="concept-document-about-base-url">about base
URL</dfn>, which is a <span>URL</span> or null, initially null.</p>

Expand Down Expand Up @@ -17901,6 +17911,36 @@ 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 any <code>meta</code> element <var>element</var> is <span data-x="node is inserted into a
document">inserted into the document</span>, or has its <code
data-x="attr-meta-name">name</code> or <code data-x="attr-meta-content">content</code>
attributes changed, user agents must run the following algorithm:</p>

<ol>
<li><p>If <var>element</var> is not <span>in a document tree</span>, then return.</p></li>

<li><p>If <var>element</var> does not have a <code data-x="attr-meta-name">name</code>
attribute whose value is an <span>ASCII case-insensitive</span> match for "<code
data-x="meta-responsive-embedded-sizing">responsive-embedded-sizing</code>",
then return.</p></li>

<li><p>If <var>element</var> has a <code data-x="attr-meta-content">content</code>
attribute and that attribute's value is not the empty string, then return.</p></li>

<li><p>If <span>the body element</span> of the <code>Document</code> is not null,
then return.</p></li>

<li><p>Set the <code>Document</code>'s
<span data-x="concept-document-responsive-embedded-sizing">responsive embedded sizing</span>
to true.<p></li>
</ol>
</div>
</dd>

@mtrootyy mtrootyy Jun 5, 2026

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The following needs to be specified for authors:

If value of name attribute is specified an ASCII case-insensitive match for "responsive-embedded-sizing", the value of content attribute must be specified the empty string.


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

<dd>
Expand Down
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