<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
video{
width:100%;
height:330px
}
</style>
</head>
<body>
<video id="myVideo" controls>
<source src="/hawk.mp4" type="video/mp4">
</video>
<p><strong>Note</strong>: 'requestFullscreen()' method can only be initiated by a user gesture, not by a programmer himself.</p>
<script>
var x = document.getElementById("myVideo");
x.requestFullscreen();
x.addEventListener("fullscreenerror", function(event){
setTimeout(function(){
alert("Unable to switch into full-screen mode.");
}, 1000);
});
</script> </body>
</html>