An improvement of the previous example on treemaps. A simple label placement algorithm is used to display the first level of the hierarchy.
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<html>
<head>
<meta charset="utf-8">
<meta name="description" content="Labeled treemap (flare)" />
<title>Labeled treemap (flare)</title>
<link type="text/css" href="index.css" rel="stylesheet"/>
<script src="https://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<svg height="500" width="960"></svg>
<script src="index.js"></script>
</body>
</html>
Modified http://d3js.org/d3.v3.min.js to a secure url
https://d3js.org/d3.v3.min.js