Re: [w3c/webcomponents] Please add <map> to the list of elements that support attachShadow(init) (#734)

@annevk Cool, thanks.  

I'll just add a question here. If, in the future, the platform decided that it needed to use a shadow root on a native element that has allowed attachShadow() (i.e. its on the safe list), would that make it impossible for the platform to use the shadow root on that element?  For instance, I believe the video element owns a shadow root, so it is not on the safe list, and so the platform 'own's the shadow root. If you decide to add (any) element to the safe list, does that mean in effect that the native element can **never** have a 'platform'-owned shadow root?

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