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

> > Yeah, allowing it based on custom element state would be okay as well. The issue is really about someone calling `attachShadow` prior to custom element being upgraded.
> 
> Thanks. So it sounds like you'd be ok with this proposed solution then? If so, and assuming no objections from anyone else, perhaps I'll start prototyping this, and I'll put together another spec PR.

With that amendment, it seems like declarative Shadow DOM would be compatible with closed shadow trees so we can assume this technical issue has been resolved.

There is still a pending question of whether we support the declarative Shadow DOM at conceptual level. I need to get back to you on that.

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