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<html>
<head>
<meta charset="utf-8">
<title>Intro D3js examples</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
.existing {color: blue;}
.new {color: green;}
</style>
</head>
<body>
<h1>Intro D3 - example01</h1>
<!--<p> previous paragraph</p>-->
<script type="text/javascript">
d3.select("body").append("p").attr("class","new").text("New Paragraph!");
</script>
</body>
</html>
https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js