<!DOCTYPE html>
<html>
<body>
<h1>HTML DOM Events</h1>
<h2>The onloadstart Event</h2>
<video controls onloadstart="myFunction()">
<source src="mov_bbb.mp4" type="video/mp4">
<source src="mov_bbb.ogg" type="video/ogg">
Your browser does not support video playback.
</video>
<p id="demo">Event has fired: </p>
<p>Video courtesy of <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML += "Loading has started";
}
</script>
</body>
</html>