<!DOCTYPE html>
<html>
<head>
<script src="//d3js.org/d3.v3.min.js"></script>
<meta charset="utf-8">
<title>text vs html</title>
</head>
<body>
<p>m³</p>
<script>
d3.select("body").append("p").text("m³");
// ||||
// ||---- text
d3.select("body").append("p").html("m³");
// ||||
// ||---- html
</script>
</body>
</html>