Re: [w3ctag/design-reviews] CSS Selectors 4, :focus-visible. (#233)

I agree that if you want `:focus` rules only for UAs that don't support `:focus-visible`, they would need to be in an `@supports` rule, although currently you can't test selector support with `@supports` rules, so it's not actually doable.  (We need to add that at some point; we might even have a WG resolution to do so...)

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