D3 Examples - ios audio context debug monkeypatch

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script src="https://cwilso.github.com/audiocontext-monkeypatch/audiocontextmonkeypatch.js"></script>
<script>
  var audioCtx = new AudioContext();
  var oscillator = audioCtx.createOscillator();
  var gainNode = audioCtx.createGain();
  oscillator.connect(gainNode); 
  gainNode.connect(audioCtx.destination);
  oscillator.type = 'sine'; 
  oscillator.frequency.value = 300;
  gainNode.gain.value = 7.5;
</script>
​
<button onclick="oscillator.start();">play</button>
</body>
​
    