D3 Examples - vega-lite testing

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<html>
  <head>
    <!-- Import Vega 3 & Vega-Lite 2 js (does not have to be from cdn) -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vega/3.0.0-beta.25/vega.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-lite/2.0.0-alpha.7/vega-lite.js"></script>
  <!-- Import vega-embed -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-embed/3.0.0-beta.7/vega-embed.js"></script>
  </head>
  
  <body>
    <div id="vis"></div>
    
    <script src="main.js"></script>
  </body>
</html>
    