This is an example of the d3Kit Skeleton, which provides simple scaffold for you to create a visualization, e.g. a bubble chart.
Try it by
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<html>
<head>
<title>Bubble Chart</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="chart"></div>
<script src="https://d3js.org/d3.v3.min.js" type="text/javascript"></script>
<script src="https://cdn.jsdelivr.net/gh/kristw/75b61f9beeab9b530612/raw/389e984e4041117a9185cf6edad9f6b85a38097a/d3kit.min.js" type="text/javascript"></script>
<script src="main.js"></script>
</body>
</html>
Modified http://d3js.org/d3.v3.min.js to a secure url
Updated missing url https://rawgit.com/kristw/75b61f9beeab9b530612/raw/389e984e4041117a9185cf6edad9f6b85a38097a/d3kit.min.js to https://cdn.jsdelivr.net/gh/kristw/75b61f9beeab9b530612/raw/389e984e4041117a9185cf6edad9f6b85a38097a/d3kit.min.js
https://d3js.org/d3.v3.min.js
https://rawgit.com/kristw/75b61f9beeab9b530612/raw/389e984e4041117a9185cf6edad9f6b85a38097a/d3kit.min.js