(optional). Set the device rotation to portrait-only
1. Start playing a video
2. Press full screen

Expected: The video goes full screen
Actual: The video is enlarged to take the full width of the screen, but as videos are  (usually) in landscape, more than half of the screen is unused. So not quite *full* screen. YouTube forces the video in landscape when Full Screen is requested, even if the device is locked in portrait mode. Maybe Chrome should do the same?