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

Back to original concern of this thread: there is a need for `common` cross-shadow-root theming. 

IMO it falls not into theming itself but into insulation layers, i.e. `scope`. The scope 
* would have common css rules( theme )
* can inherit another scope
* there are can be multiple scopes( a library concept )

In addition to CSS, `scope` can have a common custom element registry, JS insulation, etc.

Related: [DCE Security scopes](https://github.com/EPA-WG/custom-element/issues/2),
[microapplication container POC](https://github.com/EPA-WG/embed-page/issues/3)


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