Re: [csswg-drafts] [selectors4] Name the “functional pseudo-class like :matches() with 0 specificity”

@jonathantneal I don't see the cons about a pseudo-class that is "explicitly not extended-able". Can you give some context?

`:nil()` and `:zero()` seems to be the only ones where it will be clear "why we used this pseudo-selector". So they've got my vote.

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