FF121 ExperFeat: Custom element pseudo class #30394
Merged
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FF121 adds support for the Custom State Pseudo Class spec in https://bugzilla.mozilla.org/show_bug.cgi?id=1861466 behind a preference.
This adds information about the experimental feature.
Note that this replaces an older entry in the doc "ElementInternals: Form associated custom element methods and properties" which should have been removed (by me) in FF95 as this has shipped (https://bugzilla.mozilla.org/show_bug.cgi?id=1745378).
Related docs work can be tracked in #30339