Re: [webcomponents] Need to update CSS Scoping for closed shadow tree (#293)

It seems like the last meeting's consensus was that we wanted to minimize the difference between closed and open modes in terms of styling behaviors so I think 2 is not controversial.  We'll use whatever default we'd pick for both open and closed modes.

For 1, we (Apple) would not want to keep those combinators even in static profile.

For 3, we (Apple) are fine with restricting it to the simple selector especially for V1.  However, we might want to keep semantics for `::slotted` forward compatible with more complex selectors.

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https://github.com/w3c/webcomponents/issues/293#issuecomment-146123799