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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <title>Web Worker Demo</title>
</head>
<body>

<h1>Web Worker Demo</h1>

<button id="start">Start</button>
<button id="kill">Kill</button>
<textarea rows=20 cols=80 id="output"></textarea>

</body>
<script>
  var w = new Worker("web-worker.js");
  var output = document.getElementById('output');
  w.addEventListener('message', function(e) {
    output.value += e.data;
  });
  document.getElementById('start').onclick = function(e) {
    w.postMessage(["start", 23]);
  };
  document.getElementById('kill').onclick = function(e) {
    w.terminate();
  };
</script>