Re: [w3c/webcomponents] Should shadow host have `display: block` by default? (#426)

Sorry, I noticed I never replied to this:

> Would :potentially-custom only match custom element candidates that don't have a definition? That could potentially be useful for styling lazily-defined elements to speed up first paint. If it always matches custom elements, I'm less optimistic of its utility.

Yes, it would, but you could do `:potentially-custom:not(:defined)` to get the effect you're going for.

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