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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isDefaultNamespace MathML</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var MATH_NS = "http://www.w3.org/1998/Math/MathML";
    var SVG_NS = "http://www.w3.org/2000/svg";
    var mi = document.createElementNS(MATH_NS, "mi");
    document.getElementById("out").textContent =
      mi.isDefaultNamespace(MATH_NS) + "\n" +
      mi.isDefaultNamespace(SVG_NS);
  </script>
</body>
</html>

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Node.isDefaultNamespace — MathML (Try It)