How to read text that is under #shadow-root (user-agent)

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As per @hayatoito‘s (creator of Shadow DOM) comment:

The original motivation of introducing a closed shadow tree is "Never allow an access to a node in a closed shadow tree, via any APIs, from outside", AFAIK. Like that we can not access a node in the internal hidden shadow tree which is used in <video> element, in Blink.

In fact, I designed a closed shadow tree in such a way. If there is a way to access a node in a closed shadow tree, it should be considered as a bug of the spec.

I think it’s totally okay to have an API to allow an access in the layer of Chrome apps or extensions.
However, for a normal web app, I think the current agreement is "Never allow it".

If we allowed it, that means we do not need a closed shadow tree. Just having an open shadow tree is enough, I think.

Furhter @Supersharp in his comment below his own answer within the discussion How to get element in user-agent shadow root with JavaScript? mentions:

#shadow-root (user-agent) are browser vendors native implementation so they are not documented and will never be accessible. Only open Shadow DOM are, as per the specs

WebDriver perspective

Recently, @AutomatedTester [David Burns, Chief Bacon Officer, Mozilla Corporation] initiated a discussion on WebDriver – Testability of web components

Currently Selenium Team is open for accepting pull requests for the same.

Reference

You can find a couple of relevant detailed discussions in:

Outro

Here you can find a relevant discussion on How to automate shadow DOM elements using selenium?

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