Re: [w3c/webcomponents] Allowing CSS combinators postfixed to the ::slotted() selector (#889)

FWIW, if complex slotted light dom selectors were permitted, I'd expect the selector in the examples above to be `::slotted(.foo .bar)`, not `::slotted(.foo) .bar`. The latter seems to describe a slotted light dom element ".foo" with a descendent shadow element ".bar". Since that scenario can't seemingly occur, the problem might not be obvious ... but switch to just about any other combinator and you get a scenario that _can_ occur (e.g. `::slotted(.foo) + .bar` - "style the shadow `.bar` when preceded by a slot whose assignee matches `.foo`").

AFAIK, selectors like this are _also_ not currently permitted, but I'm unsure if that's a matter of deliberate design or not; they still seem to adhere to query-direct-assignees-only.

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