Re: [whatwg/dom] Revamped Scoped Custom Element Registries (DOM side) (Issue #1339)

In most scenarios those other documents don't have a browsing context so will end up with a null registry, but for `iframe` and such there would indeed be a change in behavior for elements that haven't upgraded yet. We'd have to experiment with that, but one solution if it's problematic would be to reset non-scoped registries of non-upgraded elements as well. A bit ugly, but not the end of the world.

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