Re: [webcomponents] Add a non-normative note stating elements in shadow trees aren't exposed as named properties (#304)

It seems pretty clear about "active document": https://html.spec.whatwg.org/multipage/browsers.html#named-access-on-the-window-object

The only curious thing might be whether an `<iframe>` inside a shadow tree creates a nested browsing context or not. And if not, what does it create?

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