Re: [w3ctag/design-reviews] Declarative CSS Modules and Declarative Shadow DOM `adoptedstylesheets` attribute (Issue #1000)

jyasskin left a comment (w3ctag/design-reviews#1000)

Apologies for the ignorant question, but what goes wrong if a declarative shadow root can "import" styles from anywhere else in the document (including ones serialized inside another [mode=open](https://developer.mozilla.org/en-US/docs/Web/API/Element/attachShadow#open) shadow root), but those **styles don't wind up in the `adoptedStyleSheets` array**? Are folks modifying these sheets, and expecting those modifications to change everywhere that refers to them? Are folks reading sheets out of `adoptedStyleSheets` and expecting that to be complete? I expect @justinfagnani and @EisenbergEffect are correct that this is critical; I'd just like to understand better what's relying on it.

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