Code works in chrome but not in Microsoft Edge

I have some questions about this code in javascript.

window.onload = init;
function init(){
var audio = new Audio(),
    i = 0;
var playlist = new Array('mp3.mp3', 'mp4.mp3');
audio.addEventListener('ended', function () {
    i = ++i < playlist.length ? i : 0;
    console.log(i)
    audio.src = playlist;
    audio.play();
}, true);
audio.volume = 0.3;
audio.loop = false;
audio.src = playlist[0];
audio.play();
}

It is running around now and I want it to stay after two mp3 songs. How do I do that? The second that I want to fade in when it starts. This code doesn't work in Chrome but works in the Microsoft Edge browser. What could it be?