Re: [heycam/webidl] Designing mixins (#363)

I guess it would be good to study precedent. Perhaps both is what we want.

I do think there's value to having a mixin named `DocumentOrShadowRoot` and being able to extend that. It conveys the concept of shared functionality between `Document` and `ShadowRoot` much more clearly than a bunch of `partial interface Document, ShadowRoot` would. The latter seems more accidental somehow. Similar for other mixins in DOM, such as `ParentNode`.

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