[Bug 16317] [Shadow]: Clarify the meaning of /select/ and upper boundary encapsulation, styling

https://www.w3.org/Bugs/Public/show_bug.cgi?id=16317

--- Comment #13 from Takashi Sakamoto <tasak@google.com> ---

> I mean, multiple shadow case and nested shadow case.

I forgot to ask about whether /select/ rules in inert shadow dom subtrees
should be applied or not.

Suppose that there exist the following DOM tree:

<host> ---- <sr1> ---- <sr2> ----- <sr3> ... --- <sr N>
   |
   +--child

and all shadow roots have <style> which has /select/ rules. But some of shadow
roots have no <shadow>, i.e. inert shadow roots.

I think, this should work in the same mannar as @host @-rules. /select/ rules
in inert shadow roots should not be applied. Is this correct?

And I think,/select/ rules in younger shadow DOM subtree should have higher
priority than rules in older shadow DOM subtree.

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