Re: [whatwg/dom] Add declarative Shadow DOM features (#892)

This PR has been updated to include the "opt-in" mechanics described in [#912](https://github.com/whatwg/dom/issues/912). The changes I made here roughly match the current implementation of Chromium, so I'm hoping they're functional. But comments appreciated.

Here, I am unable to figure out how to get the "magic" `{{include shadow roots state}}` to link over to the equivalent section of HTML. I get a build error there. I cannot find where in dom.bs these strings are defined.


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