Untitled

<html>
  <head>
  </head>
  <body>
    <script type="text/javascript">
      console.log("Hello, world");

      // create web audio api context
      var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

      // create Oscillator node
      var oscillator = audioCtx.createOscillator();

      oscillator.type = 'sine';
      oscillator.frequency.setValueAtTime(288, audioCtx.currentTime); // value in hertz
      oscillator.connect(audioCtx.destination);
      oscillator.start();
      setTimeout(()=> {
        oscillator.stop()
      }, 5000);
    </script>
  </body>
</html>