Re: [WICG/webcomponents] CSS selector to style slots with slotted elements (#936)

> IMHO, :has should provide that functionality. When we have .a .b relation, we can select .a with :has like this - .a:has(.b). Same with this, when we have #label-slot ::slotted(*) relation, we can select #label-slot like this - #label-slot:has(::slotted(*)).

I don't think we should do that. `:has` should be strictly about the tree in which this pseudo selector is evaluated. Otherwise, it would result in very pathological O(n^3) behavior in some cases.

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