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

That's valid. Tho if it's on all elements, it can still be fiddled with by consumers.  The ShadowRoot version worked well for that; a different form of the custom element one that instead created a token list and passed it to a CE callback (for the CE to stash on its own) would give us the same ability without having to poll anything.

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