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[css-pseudo-4] Add a note explaining Element.pseudo() behaviour #12159 #12406

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[css-pseudo-4] Add a note explaining Element.pseudo() behaviour #12159 #12406

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[css-pseudo-4] Add a note explaining Element.pseudo() behaviour #12159 
As per resolution in #12159, Element.pseudo() returns CSSPseudoElement
even when invoked on Element that can't generate the requested type.
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@danielsakhapov
danielsakhapov committed Jun 27, 2025
commit 95720cc46ae3fe23789b8669f97a9ffe32439bbc
6 changes: 6 additions & 0 deletions css-pseudo-4/Overview.bs
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Expand Up @@ -1829,6 +1829,12 @@ Additions to the CSS Object Model</h2>
(The UA may drop or regenerate the object for convenience or performance
if this is not observable.)

Note: {{CSSPseudoElement}} is returned even when this method is invoked on elements
that can't have the requested pseudo type (e.g. ''::before'' on <{input}>).
See <a href="https://github.com/w3c/csswg-drafts/issues/12159#issuecomment-3005238286">resolution</a> for more details.
Discussion in <a href="https://github.com/w3c/csswg-drafts/issues/12158">Issue 12158</a> will clarify how to
determine that the requested pseudo doesn't really "exist".

ISSUE: The identity, lifetime, and nullness of the return value
(and potential error cases)
of the {{pseudo()}} method is still under discussion.
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