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

I think supporting multiple shadow roots is the only really important requirement, so that one registry can be shared across all instances of a definition.

Other than that, I haven't heard of requests for supporting multiple documents. Sometimes printing / screenshot libraries will clone a DOM tree into an iframe, which is something to consider, but I think the ones that handle shadow roots aren't also registering any elements in the iframe - they're just deeply cloning un-upgraded nodes and adding shadow roots as needed.

Agreed that the major cost of definitions is the JS time, but for 100s of definitions and 1000s of elements (largest app I know of is ~1k definitions, ~7k nodes) this could be non-trivial, especially if every definition has its own registry.

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