Pseudos after ::part() are valid #43796
Merged
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https://drafts.csswg.org/selectors/#pseudo-element-states restricts pseudo-classes on pseudo-elements to the user action and logical combo ones by default, but allows other specs to allow other pseudos.
https://drafts.csswg.org/css-shadow-parts/#part allows all pseudo-classes (but defines that a few never match, if they reveal tree structure).