>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 STR_1: 1. Open https://www.iandevlin.com/html5test/webvtt/html5-video-webvtt-sample.html , play the video 2. Focus fullscreen button in video 3. Press Enter to enter DOM fullscreen mode, then Escape to exit DOM fullscreen 4. Press Tab several times AR: No visible action ER: Focusring should cycle through focusable elements on page Note: You can click fullscreen button inside the video instead of Steps 2,3 with the same effect.
Component: Untriaged → Video/Audio Controls
Product: Firefox → Toolkit
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