Re: [whatwg/dom] custom element registry mutability in an element (Issue #1414)

sorvell left a comment (whatwg/dom#1414)

I think the behavior we want here is that the custom element registry can only mutate if:
1. it is currently null.
2. it is being adopted into a new document and it has the global registry of the source document (which could be null) *and* is *not* customized. Correct me if I'm wrong, but I think this case is only really important for backwards compatibility?

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