Re: [w3c/webcomponents] Custom pseudo-classes for host elements via shadow roots (:state) (#738)

@dvoytenko absolutely, especially in combination with `::part()`.

A custom element may very well want to make public a part that itself has state, and the part may not be a custom element itself. The natural way to do this would be to have the custom element set the state on the part. I would like that feature, and it's been discussed, but I would rather have basic custom state support sooner.

The workaround is to make a custom element just for to have custom state settable from the outside, maybe a `<div-with-state>` element.

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