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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>lookupNamespaceURI xml xmlns</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var el = document.createElement("div");
    document.getElementById("out").textContent =
      el.lookupNamespaceURI("xml") + "\n" +
      el.lookupNamespaceURI("xmlns");
  </script>
</body>
</html>

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Node.lookupNamespaceURI — xml / xmlns (Try It)