D3 Examples - Number of cities

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<head>
  <meta charset="utf-8">
  <title>Cities</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <!-- d3-hexgrid script comes first. -->
  <script src="//unpkg.com/d3-hexgrid"></script>
  <script src="//unpkg.com/d3"></script>
  <script src="//unpkg.com/d3-geo-projection"></script>
  <script src='//unpkg.com/simple-statistics'></script>
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</head>
<body>
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    <div id="container">
   <canvas></canvas> 
  </div>
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  <script src="app.js"></script>
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</body>
</html>
    