[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 #10 from Takashi Sakamoto <tasak@google.com> ---
I'm sorry. I would like to confirm one more thing.
The spec only says:

Otherwise, if RULE is either an @host @-rule or contains a select reference
combinator and RULE is declared in shadow root style sheets:
- Let BOTTOM the shadow DOM subtree, with which these shadow root style sheets
are associated
- If the shadow host of BOTTOM is in TREE, then RULE is applicable in TREE.

RULE is applicable in TREE means,
----
Suppose that there are several different shadow hosts, e.g.

<shadow host1>
...
<shadow host2>
..
<shadow hostN>

Every shadow host's shadow dom subtree has some rule which has /select/. If the
rules are very simple, e.g. content /select/ * or shadow /select/ *, shadow
host1's rule can be applied to shadow hostN?
----

I think, shadow host1's rules which have /select/ can be applied to only shadow
host1's children. shadow hostN's rules which have /select/ can be applied to
only shadow hostN's children.

So probably we need some comment about "scope" of rules which has /select/.

Best regards,
Takashi Sakamoto

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