Re: [WICG/webcomponents] Scoped Custom Element Registries (#716)

We have quite a few major customers, including Google as a whole that need this feature.

I have talked with @mfreed7 about the open issues and when Chrome could prototype this feature to get real implementation feedback on the open questions.

At least for the upgrade ordering question (#923) , it seems like a path forward might be specifying document order upgrades and letting implementations optimize as they can by tracking which shadow roots are associated with which registries to avoid a whole document tree walk.

I think #914 is solvable by requiring top-down upgrade order, and #907 could be informed with implementor feedback.

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