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Greg Tatum
cff6e11198
In the Smart Window tests it can be quite confusing to query select and find an element that you need access to. This commit creates a new testing primitive that makes it easy to cut across shadow root boundaries and query select through open or closed shadow roots. Many Smart Window tests confuse the behavior of being blocked by a shadow root, and being blocked by content being in a content process. This reduces the potential confusion and complexity around selecting these components, as frequently tests are using SpecialPowers.spawn to unnecessarily complicate tests, when it's really just hidden within the shadow dom. Differential Revision: https://phabricator.services.mozilla.com/D297913