<!DOCTYPE html>
<html>
<body>
<p>Press play and wait for the audio to end.</p>
<audio id="myAudio" controls>
<source src="horse.ogg" type="audio/ogg">
<source src="horse.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>
<script>
var aud = document.getElementById("myAudio");
aud.onended = function() {
alert("The audio has ended");
};
</script>
</body>
</html>