Re: [w3c/webcomponents] [WebDriver] Testability of web components (#771)

> We need to have something where we are not trying to run JS before something else could be. This approach, which is fine for now, will lead to a point where the atoms lose the race. We need a solution that never hits that situation.

@AutomatedTester yes, that's why we are supportive of such API, so we don't have to play the race game.

> @diervo what does a selector look like for you? Do you need to explicitly specify each element that has a shadow root along the way?

Yes, you have to get inside the shadow at every level, unless you rely on our high level API to access page segments as @diervo described above. We don't want arbitrary queries to return stuff from inside a shadow. We did entertained the idea of using something equivalent to ::shadow selector (IIRC), but that might confuse folks that they might be able to use the same selector in production code, which will not work.

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