<!DOCTYPE html>
<html>
<body>
<p>This example uses the addEventListener() method to attach a "progress" event to a video element.</p>
<video controls id="myVideo">
<source src="mov_bbb.mp4" type="video/mp4">
<source src="mov_bbb.ogg" type="video/ogg">
Your browser does not support HTML5 video.
</video>
<p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>
<script>
document.getElementById("myVideo").addEventListener("progress", myFunction);
function myFunction() {
alert("Downloading video");
}
</script>
</body>
</html>