WebKit export of https://bugs.webkit.org/show_bug.cgi?id=264226 #43541
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This resyncs the work done as part of WebKit/WebKit#20012 to get CustomStateSet and the
:state()
pseudo selector into WebKit.This includes the refactoring done to the existing state tests, which use the
:--foo
syntax that Chrome initially adopted. This syntax is no longer proposed, as the CSSWG has opted to use the:state(foo)
syntax.Both WebKit and Firefox now have the
:state()
syntax.