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[selectors-4] Clarify that :picture-in-picture applies to element in opener window #13720
Description
The definition of the :picture-in-picture pseudo-class is vague about whether it matches the in-page (placeholder) element or the one shown within the picture-in-picture window.
Given existing implementations, it is obviously meant to match the element in the opener viewport, so it is possible to style the element as a placeholder.
Though the current spec text at least caused confusion for the implementors in Gecko.
Sebastian
Activity
svgeesus commentedon Apr 9, 2026
@tabatkins @fantasai can this be clarified before we go to CRS, as it has caused an interop issue despite being editorial?
svgeesus commentedon Apr 13, 2026
@SebastianZ as the intended meaning is clear, would you like to make a PR to clarify the spec?
svgeesus commentedon May 27, 2026
@SebastianZ gentle nudge
svgeesus commentedon May 28, 2026
Agenda+ to get a resolution on this, with input from the editors.
[selectors-4] Clarify :picture-in-picture applies to the embedder ele…
tabatkins commentedon May 28, 2026
We don't need a resolution on this, it's just clarification. Fixed with @fantasai .
SebastianZ commentedon May 29, 2026
Thank you @tabatkins and @fantasai! And sorry @svgeesus, I wasn't keeping up with my CSSWG mails lately.
Sebastian