<!doctype html>
<html>
<head>
<title>Audio</title>
</head>
<body>
<script>
function play() {
var audio = document.getElementById("audio");
audio.play();
}
</script>
<input type="button" value="PLAY" onclick="play()">
<audio id="audio" src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.mp3"></audio>
</body>
</html>