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

Consensus at TPAC 2016 f2f: although Google had some cases that people want to use '>>>' for querySelector/querySelectorAll, it was not enough evidence that every browser is convinced to implement the feature, so this proposal is abandoned.

Pros:
- For open shadows, it would give uses performant primitive to find element(s), such as `document.querySelector('html >>> [i18n-translatetext]')` for finding nodes that require text translation.

Cons:
- It can be emulated using traversing a node tree.
- It breaks encapsulation for open shadow roots.
- It does not work for closed mode shadow root at all.


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