Custom visuals designs with vega.js (I)

Draft for making custom visual designs with vega.js

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdn.jsdelivr.net/npm/vega@4"></script>
    <script src="https://cdn.jsdelivr.net/npm/vega-embed@3"></script>
</head>
​
<body>  
  <div id="vis"></div>
  
  <script>
    const spec = "spec.vg.json";
    vegaEmbed('#vis', spec, {defaultStyle: true});
  </script>
</body>
    

https://cdn.jsdelivr.net/npm/vega@4

https://cdn.jsdelivr.net/npm/vega-embed@3