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

This still won't address the issues that @dflorey described in #864: an end user, importing and using 3rd party elements, can not force the components to call their own `attachShadow` methods with a setting to make styles leak in, except by monkey patching `attachShadow` (which may not be possible with declarative ShadowDOM and `elementInternals` where `attachShadow` is not called).

People are still going to be asking how to style 3rd-party elements from outside when the element authors have not called `attachShadow` with `open-stylable` or similar.

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