Re: [WICG/webcomponents] "open-stylable" Shadow Roots (#909)

It's clear to me that we must support selective sharing of CSS rules. Otherwise, people will inevitably ask for ways to filter out shadow roots / host amongst shared style rules next if we just provide a way to either share all styles or none.

Conceptually, this problem of sharing styles across multiple components seems very similar to the problem of sharing a custom element registry across multiple components. Yet for scoped custom registers, we're not envisioning to have a single boolean flag to indicate whether a scoped custom element registry is shared with its parent tree or not because such an API would be too limiting. I think a similar argument can be made for sharing styles as well. Heck, the argument for selective style sharing might be stronger for styles due to the whole cascading & specificity fiasco.

So thinking out loud, I wonder if an alternative solution / API shape here is to make style scope an actual object and make it possible to share it across shadow trees like we do envision with a scoped custom element registry. That will provide some standard API for component authors & users to coordinate style sharing.

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