Re: [webcomponents] [Shadow]: Need an equivalent definition of 'in a Document' for shadow trees (bugzilla: 26365) (#57)

label.htmlFor as an example is a case where we don't want shadow DOM to be treated as if it was in document
https://html.spec.whatwg.org/#attr-label-for
since that would end up leaking label inside shadow DOM to the outside world
(via labelableControl.labels)

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