<!DOCTYPE html>
<html lang="en-US">
<body>
<video style="width:100%;height:330px" controls>
<source src="/reindeer.mp4" type="video/mp4">
<track src="/reindeer.vtt" kind="subtitles" srclang="en" label="English" oncuechange="myFunction()">
</video>
<script>
function myFunction(){
alert("Caption is changing");
}
</script>
<p><strong>Note</strong> : Please turn on video captions/subtitles.</p> </body>
</html>