D3 Examples - Marker animation along SVG <path> element with D3.js III

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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<head>
  <title>SVG path animation</title>
  <link href="style.css" rel="stylesheet">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <script src="https://d3js.org/queue.v1.min.js"></script>
</head>
<body>
  <!-- start -->
  <div id="pathAnimation">
    <script src="pathAdvancedFollow.js"></script>
    <form>
      <input type="checkbox" id="pathTrigger" name="visibility" value="hidden">Show/Hide path</br>
    </form>
  </div>
  <!-- end -->
</body>
</html>
    