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var video = document.querySelector('#YourVideoId');
var promise = video.play();
if (promise !== undefined) {
promise.then(_ => {
// Autoplay started!
}).catch(error => {
// Autoplay not allowed!
// Mute video and try to play again
video.muted = true;
video.play();
// Show something in the UI that the video is muted
});
}