Re: [w3c/webcomponents] Add Scoped CustomElementRegsitry explainer (#865)

So how well established are the requirements? In terms of supporting multiple shadow roots, documents, etc. And by registration cost do you mean define/upgrade cost? It seems that running JavaScript would easily be the most expensive there. (Not saying that we should accept large tree walks if we can avoid them, but consistency and simplicity in the high-level design are also worthy goals.)

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