file_webAudio.html

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<!DOCTYPE html>

<head>

  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">

  <meta content="utf-8" http-equiv="encoding">

</head>

<body>

<pre id=state></pre>

<button id="start" onclick="start_webaudio()">Start</button>

<button id="stop" onclick="stop_webaudio()">Stop</button>

<script type="text/javascript">

  var ac = new AudioContext();

  var dest = ac.destination;

  var osc = ac.createOscillator();

  osc.connect(dest);

  osc.start();

  document.querySelector("pre").innerText = ac.state;

  ac.onstatechange = function() {

    document.querySelector("pre").innerText = ac.state;

  function start_webaudio() {

    ac.resume();

  function stop_webaudio() {

    ac.suspend();

</script>

</body>