How to add an attribute?

Question

JavaScript

jQuery('video').attr("playsinline", "")
You need to add a playsinline attribute with no value to the video tag, so jQuery('video').attr("playsinline") doesn't. If with value then adds.

Answer 1

jQuery('video').attr("playsinline", "")

This way should work. Maybe your script is loaded first and then the video element?
Try adding a little delay to test this.

setTimeout(function() {
 jQuery('video').attr("playsinline", "");
}, 2000);

You can also try this
$('video')[0].setAttribute("playsinline","");