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Mike Conley authored
Bug 1548296 - Attach Picture-in-Picture toggle on UAWidgetSetupOrChange event rather than canplay. r=JSON_voorhees Videos can fire their "canplay" events even when they're not part of the DOM. This means that videos that have already fired that event won't get the PictureInPictureToggleChild properly attached after being inserted. The UAWidgetSetupOrChange event, however, is fired for video events once they've been bound to the DOM, so we can use that instead. Differential Revision: https://phabricator.services.mozilla.com/D44541 --HG-- extra : moz-landing-system : lando
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