Re: [w3c/webcomponents] Theming options for shadow roots (#864)

Using `@` rules is an interesting idea. The one problem I see with that approach is that users of components can defile an arbitrary list of selectors. How does component define which elements' styles can be overridden, and which one can't be?

Another complain / concern I have with `::part` and the old `::theme` is that there isn't a convenient way to specify a set of properties which are allowed to be changed. It seems like a pretty big oversight to me.

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