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

> > @diervo So are all your shadow DOMs open.
> 
> @jgraham, they could be open or closed, depending on some other boundaries (e.g.: is the child and parent from the same developer, or not). But that is irrelevant because we could bypass that by patching the `attachShadow()` mechanism to always store a reference of the shadowRoot somewhere, e.g..: `elm.__nakedShadow__`, so our `expandShadow` mechanism can use that instead of just `elm.shadowRoot` which is dictated by the `mode` configuration.

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.

As for `expandShadow`, this is kind of along the same lines as my original PR for a "switch to shadow root`. We can change it to "getShadowRoot" or whatever really and then carry on from that point. It can easily be integrated into most peoples abstractions for their web application.

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