document.getElementById('player').addEventListener('ended', function() {
alert('The end!');
}, false);document.addEventListener('DOMContentLoaded', function() {
var li = document.querySelectorAll('li');
li[Math.floor(Math.random() * li.length)].style.display = 'list-item';
}, false);$(function() {
var li = $('li');
li.eq(Math.floor(Math.random() * li.length)).show();
});div {
height: 100vh;
}