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

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Node.isDefaultNamespace — SVG (Try It)