Re: [w3c/webcomponents] Is there a way to retrieve the localName from a custom element constructor? (#566)

@annevk:
> custom elements have a 1:1 mapping, builtins do not. What kind of API do you envision?
> how would a global API for both builtin and custom elements work for scoped registries? Or are scoped registries not something Google-at-large is advocating for?

 I agree that this isn't straightforward. For scoped registries, since they're scoped to the shadow root, I would think that whatever API we develop for builtins should "just work" there also. But I suppose that depends on the details of the API. Anyway, since we're okay moving ahead without support for builtins, we can punt these questions until later. I should point out that "Google-at-large" is a big place with differing opinions.

@rniwa:
> Given there have been no concrete use case presented for retrieving builtin elements' name given their constructors, I don't think supporting builtin elements make sense.

Ok. We are ok moving ahead without builtin support for now, given the strong developer demand for this feature.


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