Re: [w3c/webcomponents] Which standard defines :defined (#665)

The purpose of the distinction is that the CSSWG typically defines the actual CSS thing, and when necessary, the host language fills in whatever language-specific details are required.  This distinction isn't theoretical wankery; SVG and HTML define things separately sometimes (or at least did in the past).

But there's nothing theoretically wrong with another spec defining a pseudo-class, so long as it has enough visibility for the correct implementors to know about it.

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