Re: [webcomponents] Style attributes in Shadow DOM Cascade Order Proposal (#316)

IIUC in *Proposal 1* a style rule in `A` wins against inline style of an element in `B` tree.
This situation can't happen (as Hayato wrote in the document) without `/deep/` and `::shadow`,
but considering custom pseudo elements, `A` could win against inline style.

Quoting Hayato's doc:
> As I said, [A] never matches an element in B in the current spec. However, if we support custom pseudo elements, Issue #300 , we should consider it. That's the reason I've added [A] there.

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https://github.com/w3c/webcomponents/issues/316#issuecomment-170819717