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

Which part of the comment are confusing?

FYI. The semantics of `::slotted` (`::content`) is now under the discussion in 
https://github.com/w3c/webcomponents/issues/331.
I think whether open or closed is irreverent for `::slotted`, at least.


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