Re: [csswg-drafts] [selectors] Functional pseudo-class like :matches() with 0 specificity

@tabatkins 
Interesting idea, certainly more readable than current specificity hacks!
However, I wonder if it would be better to add single-argument `:is()` to level 4 and extend to allow for a second argument in Level 5? I'm a bit concerned that the extra functionality might slow down implementations, and since selectors don't fall back as gracefully as other unsupported CSS features, adoption will be slow anyway.

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