index.html

<!doctype html>
<html>
  <head>
    <title>Audio test</title>
    <script>
      /**
        * Plays a sound using the HTML5 audio tag. Provide mp3 and ogg files for best browser support.
        * @param {string} filename The name of the file. Omit the ending!
        */
      function playSound(filename){
        var mp3Source = '<source src="' + filename + '.mp3" type="audio/mpeg">';
        var oggSource = '<source src="' + filename + '.ogg" type="audio/ogg">';
        var embedSource = '<embed hidden="true" autostart="true" loop="false" src="' + filename +'.mp3">';
        document.getElementById("sound").innerHTML='<audio autoplay="autoplay">' + mp3Source + oggSource + embedSource + '</audio>';
      }
    </script>
  </head>

  <body>
    <!-- Will try to play bing.mp3 or bing.ogg (depends on browser compatibility) -->
    <button onclick="playSound('metronome');">Play</button>
    <div id="sound"></div>
  </body>
</html>