[Bug 19663] New: [Shadow]: Who uses a '/select/ reference combinator'? A component author or a component user?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19663

          Priority: P2
            Bug ID: 19663
          Assignee: dglazkov@chromium.org
            Blocks: 14978
           Summary: [Shadow]: Who uses a '/select/ reference combinator'?
                    A component author or a component user?
        QA Contact: public-webapps-bugzilla@w3.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: hayato@chromium.org
          Hardware: PC
            Status: NEW
           Version: unspecified
         Component: Component Model
           Product: WebAppsWG

Suppose the following DOM tree:

<div id='host'> (shadowhost)
  - <div>
     - <p>

<Shadow Root of 'host>
  - <content id='content' select='div'>


And suppose we want to style a distributed node, <p>, using a /select/
reference combinator as follows:

[Rule A]:
#content/select/div > p {
  color: blue
}


I have a question:
 Who supposes to use 'Rule A'? A component author or a component user?

I mean where this 'rule A' should be defined? I supposed that the rule should
be defined in the shadow Root since this selector is supposed to be used by
component authors. But I am not sure and would like to make it clear.

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