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[css-pseudo] Extend CSSPseudoElement to all standardized non-element-backed tree-abiding pseudo-elements #13940

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Merged
tabatkins merged 2 commits into from
May 21, 2026
Merged

[css-pseudo] Extend CSSPseudoElement to all standardized non-element-backed tree-abiding pseudo-elements #13940

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[css-pseudo] Extend CSSPseudoElement to all standardized non-element-…
danielsakhapov May 19, 2026
6120728
Reject non-tree-abiding pseudos
danielsakhapov May 20, 2026
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16 changes: 14 additions & 2 deletions css-pseudo-4/Overview.bs
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Expand Up @@ -1810,7 +1810,9 @@ Additions to the CSS Object Model</h2>

The <dfn attribute for=CSSPseudoElement>type</dfn> attribute
is a string representing the type of the pseudo-element.
This can be one of the following values:
This can be any standardized [=tree-abiding pseudo-element=]
that is not an [=element-backed pseudo-element=],
for example:

<dl>
<dt><code>"::before"</code>
Expand All @@ -1819,6 +1821,10 @@ Additions to the CSS Object Model</h2>
<dd>Represents the ''::after'' pseudo-element.
<dt><code>"::marker"</code>
<dd>Represents the ''::marker'' pseudo-element.
<dt><code>"::backdrop"</code>
<dd>Represents the ''::backdrop'' pseudo-element.
<dt><code>"::view-transition"</code>
<dd>Represents the ''::view-transition'' pseudo-element.
</dl>

The <dfn attribute for=CSSPseudoElement>element</dfn> attribute is the
Expand Down Expand Up @@ -1881,7 +1887,13 @@ Additions to the CSS Object Model</h2>
2. If |type| is failure,
return null.

3. Otherwise, return the {{CSSPseudoElement}} object
3. If |type| is an [=element-backed pseudo-element=],
return null.

4. If |type| is not a [=tree-abiding pseudo-element=],
return null.

5. Otherwise, return the {{CSSPseudoElement}} object
representing the pseudo-element
that would match the selector |type|
with [=this=] as its [=originating element=].
Expand Down