Hello WebKittens, I've added the support for selecting content across shadow DOM boundaries in https://trac.webkit.org/r236519, and adding the support for copying & pasting content with such a selection in https://webkit.org/b/157443. Chrome more or less supports a similar behavior.
While I've done my due diligence to test as much as possible, if you're about to branch or otherwise ship your WebKit port as a product, you may want to make sure SelectionAcrossShadowBoundaries internal debug feature is disabled in your branch. - R. Niwa
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