This issue only needs to be tested in iOS. In the app, login in master site and go to MM Dev Testing course > H5P > Interactive video (no tracking). Check that our "fake" fullscreen is activated or de-activated when clicking either the full screen button below the Youtube video or the full screen button in the header of the app. Both buttons should do the same and can be combined (e.g. enter fullscreen using the Youtube button and leaving it using the header button). After leaving this full screen at least once, rotate the device. Check that everything looks fine (the view adapts to the screen size, it doesn't overflow or fills only part of the screen). Now leave the activity and go to "Resource: File > Video file". Play the video. If you're using iPhone, it plays in full screen automatically. If you're using iPad, click the top-left button to make it full screen. After leaving this full screen, rotate the device. Check that everything looks fine (the view adapts to the screen size, it doesn't overflow or fills only part of the screen). Now leave the activity and go to "Resource: Page > Youtube video". Click the full screen button in the Youtube video. In iPhone, check that it opens a real full screen. In iPad, a message will be displayed saying that full screen is not supported. iPhone only: after leaving this full screen at least once, rotate the device. Check that everything looks fine (the view adapts to the screen size, it doesn't overflow or fills only part of the screen).