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

The reason this is mildly important: a past consensus was to expose this on ShadowRoot. This would be a bit more consistent with ::part. The main reason to expose it on ElementInternals instead would be if we believe it's useful to have custom states without having a Shadow DOM. I guess you could imagine custom elements that use the light DOM for their internals, but we felt no need to make ::part available in that case. Going the other way, is :state useful if you use Shadow DOM without custom elements? Doesn't seem intuitively obvious that ::part would be a Shadow DOM thing but :state would be a Custom Elements thing.

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