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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>prefix null in XML</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var xml = '<root xmlns="urn:default"><child>Hi</child></root>';
    var doc = new DOMParser().parseFromString(xml, "application/xml");
    var root = doc.documentElement;
    var lines = [];
    lines.push("root.prefix: " + root.prefix);
    lines.push("child.prefix: " + root.firstElementChild.prefix);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.prefix — no prefix in XML (Try It)