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

We’re experimenting with `collectMatchingElementsInFlatTree` (implemented in https://trac.webkit.org/changeset/208878) which finds all elements that match a given selector in each tree instead of an explicit `>>>` to cross a shadow boundary because we found that most use cases of this API involved looking for an element of a specific type (e.g. custom element, an element with a specific attribute, etc…) and didn’t warrant matching a specific tree structure across shadow boundaries.

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