Autostart a youtube video from Javascript

I am trying to automatically start a youtube video when it loads and when it finishes I want it to alert that it's done.

This is my HTML/JS

<div id="player"></div>

<script src="http://www.youtube.com/player_api"></script>

<script>

    // create youtube player
    var player;
    function onYouTubePlayerAPIReady() {
        player = new YT.Player('player', {
          height: '390',
          width: '640',
          videoId: '0Bmhjf0rKe8',
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange
          }
        });
    }

    // autoplay video
    function onPlayerReady(event) {
        event.target.playVideo();
    }

    // when video ends
    function onPlayerStateChange(event) {        
        if(event.data === 0) {            
            alert('done');
        }
    }

</script>

The part that alerts when the video is done is working but the auto-player doesn't. I HAVE TRIED TO PUT THE ?AUTOPLAY=1 TAG AFTER THE VIDEO URL BUT THAT DOESN'T SEEM TO WORK EITHER!

I have seen all the variations to this question and tried all the anwsers but none of them work.

Does anyone have any idea on what I should try next?

Thanks to cat my problem is solved!

All I had to do is go to chrome://flags/#autoplay-policy and select "No user gesture is required" in the dropdown menu under the "Autoplay policy" and then relaunch chrome.