Re: [WICG/webcomponents] [scoped-registries] Interaction with declarative shadow DOM (#914)

> we need to clarify whether the registry can change over time... A registry changing over time is something that has also come up in #907 (moving shadow roots between documents).

Before that can be possible, https://github.com/WICG/webcomponents/issues/754 needs a solution (and the issue should be left open). If a registry is removed, then the element is effectively no longer defined relative to the root from which the registry was removed from, and the no-longer-defined elements should be downgraded (I think [Option 2 of the "two ideas"](https://github.com/WICG/webcomponents/issues/754#issuecomment-793073650) is the best way to downgrade).

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