Re: [webcomponents] Change registries to be per document and never shared between documents (#369)

I've yet to hit the multi-doc issue in practice because I've personally stayed in the proto definition/registration lane, but always wondered how one might deal with it. Glad to see it fleshed out in such thoughtful detail.

Oh, and thank you for continually using "X-Tag" in your examples ;)

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https://github.com/w3c/webcomponents/issues/369#issuecomment-191807805