Re: [w3c/webcomponents] Expose shadowRoot on element internals (#871)

> I wasn't really thinking about subclassing. I was thinking about a custom element with a shadow root that does not prevent "internals" from being attached.

@annevk I thought element internals attachment was only possible during the construction phase, in which case, anyone getting a handle on the element after construction should not be able to gain access to the shadow root, unless they subclass it.

> I'm not sure how the subclassing scenario would work. How would the subclass get access to the internals/shadow root of the super?

If the super doesn't attach the internals, the subclass could just for the purpose of gaining access to the shadow root instance. But since most code uses dot notation, it is already possible for a subclass to trick the super by providing its own implementation of attachShadow, or attachInternals.

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