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Revert "Bug
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- Gate Spotlight.close() to owning window to prevent TOU modal from closing when clicking on links r=omc-reviewers,sachung,emcminn" for causing bc failures at browser_privatebrowsing_about_nimbus_messaging.js
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resizeTestHelper.js
ResizeTestHelper is a framework to test ResizeObserver notifications. Use it to make assertions about ResizeObserverEntries. This framework is needed because ResizeObservations are delivered asynchronously inside the event loop. Features: - can queue multiple notification steps in a test - handles timeouts - returns Promise that is fulfilled when test completes. Use to chain tests (since parallel async ResizeObserver tests would conflict if reusing same DOM elements). Usage: create ResizeTestHelper for every test. Make assertions inside notify, timeout callbacks. Start tests with helper.start() Chain tests with Promises. Counts animation frames, see startCountingRaf
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