Initial reproduction steps. When trying to watch a video on webmd.com in full screen on an iPhone, the video enters full-screen mode and then immediately exits full-screen mode, and stops playing the video as a result. Steps To Reproduce: 1. Launch Safari 2. Access webmd.com 3. Access a page on webmd with a video, such as https://www.webmd.com/coronavirus-in-context/video/anthony-fauci 4. Tap the play button to play the video 5. Tap the fullscreen icon in the bottom right of the video Results: Video will fullscreen for a second, then exit back out of full screen and stop playing. Disabling Site Specific Hacks on an iOS device, and trying to reproduce. It doesn't reproduce on https://www.webmd.com/coronavirus-in-context/video/anthony-fauci and it doesn't reproduce on https://player.akamai.com/demos/ and it doesn't reproduce on https://foxnews.com/ example https://www.foxnews.com/lifestyle/viral-video-chimpanzee-mom-holds-newborn-baby-first-time-2-day-separation#spark_wn=1
<rdar://problem/102636420>
Pull request: https://github.com/WebKit/WebKit/pull/6776
Committed 257107@main (75437028a4f8): <https://commits.webkit.org/257107@main> Reviewed commits have been landed. Closing PR #6776 and removing active labels.