Re: [WICG/webcomponents] [scoped-registries] Element upgrade ordering (#923)

FWIW, traversing documents in their creation order isn't a thing so we'd need a way to sort documents in that order, which could be quite expensive. Furthermore, each scoped registry needs to remember the set of documents that contain a shadow tree which uses the registry anyway since otherwise UA would have to traverse through all documents in the creation order and filter those that do (e.g. by having a set of all scoped registries per document).

My preference is to still use the ordering we agreed to during TPAC since it's a lot simpler to spec and implement.

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