Which standard defines :defined #665
Description
HTML suggests https://html.spec.whatwg.org/#pseudo-classes are all defined in Selectors and CSS UI, but that doesn't appear to be the case for :defined.
cc @snuggs
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HTML suggests https://html.spec.whatwg.org/#pseudo-classes are all defined in Selectors and CSS UI, but that doesn't appear to be the case for :defined.
cc @snuggs