Re: [w3c/webcomponents] Support /deep/ in static profile (bugzilla: 28591) (#78)

Please remove "breaks encapsulation of Shadow DOM" from the concerns because `>>>` must not *cross* closed shadow roots in any sense.

An open shadow roots already provides `Element.shadowRoot`. So the use case should be the same for `Element.shadowRoot`, basically.

The point is that `>>>` in the static profile is just a *utility* feature which can be polyfill-able by JavaScript.
However, having `>>>` in the Web Platform makes the Web faster, and reduces the burdens of web developers.

`>>>` does not provide any value for closed shadow roots.


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