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

> 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

The should not be able to. A component should only expose internal DOM to styling if it opts-into it. Otherwise it's taking on potentially breakable API contracts it might not want to.

If a user patches `attachShadow()` or the element definition directly, they know they're off the well-lit path for that element.

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