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I found it impossible to fill in high video iphoneXR phone displays when using the video playback video, but otherwise the phone does not have this error.
solution:
Add a video label object-fit: cover;
Cause of the problem: Since the top iphoneXR and other phones are not the same, so the iphoneXR set up some processing, leading to find a video can not fill the entire height, all use
object-fit: cover; set fill so that the height and width