Re: [webcomponents] Define the behavior of '::slotted' (the former name is '::content'). (#331)

Yeah, I do not have a strong opinion on this as long as the support cost do not get increased.

AFAIR, the selector spec said that a selector can not have multiple pseudo elements, but it looks this limitation was removed from the editor's draft.

Regarding with `::before` and `::after`, I think it's okay to support if we can support that easily.

@tabatkins,
Can we we allow multiple pseudo elements *in a row*? e.g. `::slotted(div)::before`
Is this a right direction?




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