Re: [csswg-drafts] [css-scoping-1] Let :host/:host-context/::slotted take a single compound (#5673)

cc @tabatkins @emilio 

I've been trying to understand exactly how specificity is supposed to work for :host() etc. Currently the spec says "that of a pseudo-class, plus the specificity of its argument", without sufficiently handling the fact that "the argument" is a _list_. Anyway, this becomes a non-issue if we only allow one selector.

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