Re: [csswg-drafts] [css-scoping] Consider aligning ::slotted() for fallback content with implementations (#5482)

Looking at this again, yeah, I'm pretty sure I need to, somehow, invoke [find flattened slotables](https://dom.spec.whatwg.org/#find-flattened-slotables) for the purpose of gathering the elements that'll be matched by the `::slotted()`'s selector argument.

That'll mean that `slot` elements never match `::slotted(slot)`; this won't match Safari, but it'll match other parts of their behavior, and match Chrome and Firefox, and I think match the intended mental model better.

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