D3 Examples - Scale markers in a Vega group marker

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<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Vega scale markers in group</title>
    
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vega/3.0.0-beta.32/vega.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-lite/2.0.0-beta.3/vega-lite.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-embed/3.0.0-beta.14/vega-embed.js"></script>
  
</head>
<body>
​
  <div id="vis"></div>
  <script>
    var opt = {
      "renderer" : "svg",
      "actions" : {export: true, source: false, editor: false},
    }
    
    vega.embed('#vis', 'group.json', opt);
  </script>
​
</body>
</html>
    