Re: [w3c/webcomponents] A way to implement :hover, :active, etc, for custom elements. (#738)

I tend to agree with @rniwa on using shadow roots as the extension hook for all things, in order to preserve the encapsulation boundary.

(I do see a small problem here with tying a11y to shadow roots in that we allow `attachShadow()` on a large number of elements with custom a11y bindings.)

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