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

> I don't really understand your cross-document concern.

Just hoping to ensure we're covering it well. Mostly I wanted to make sure template cloning would be ok since this is a framework [hot path](https://github.com/sveltejs/svelte/blob/main/packages/svelte/src/internal/client/dom/template.js#L51), but we've also seen a surprising interest in moving custom elements between documents, e.g. with the [PIP api](https://developer.mozilla.org/en-US/docs/Web/API/Document_Picture-in-Picture_API).

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