Consider the following test file: https://jyavenard.github.io/htmltests/tests/mse_mp4/bipbop_fullscreen.html The page has a video element within a <div></div> It has two buttons, one will call requestFullscreen() on the video element, the other on the div parent element instead. STR: On an iPad: 1- Load the page https://jyavenard.github.io/htmltests/tests/mse_mp4/bipbop_fullscreen.html 2- click on the button "video fullscreen" 3- now press the PiP button in the top left corner 4- tap on the "video fullscreen button again" Now, notice that after step 2, no banner "jyavenard.github.io is in fullscreen is shown" and step 4 does nothing. Now we repeat the above steps, but this time with the "Div fullscreen" button 5- Load the page https://jyavenard.github.io/htmltests/tests/mse_mp4/bipbop_fullscreen.html 6- click on the button "video fullscreen" 7- now press the PiP button in the top left corner 8- tap on the "video fullscreen button again" Now, notice that after step 6, the banner "jyavenard.github.io is in fullscreen" is shown and step 8 the element goes to full screen. From a user perspective, the end result is the same: the video plays in full screen. However, depending on which element the JS called to go into fullscreen, there are subtle differences that I believe shouldn't exist.