I have iframe and i insert video (mp4) in iframe. After that i open this video in full screen after that i close full screen mode and after close full screen mode browser trigger go back history
Could you please provide a complete test (either attached here or hosted somewhere)?
Created attachment 433672 [details] Video with reproduced error
<rdar://problem/80682841>
This behavior is intentional, though it sounds like it's buggy. The intent is that, when a user clicks a link to a media file, it opens in fullscreen mode, and closing the fullscreen presentation will take them back to the original page. This _should_ only occur in a top-level document navigation, not an iframe.