HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>lookupPrefix fragment</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var XLINK_NS = "http://www.w3.org/1999/xlink";
    var frag = document.createDocumentFragment();
    document.getElementById("out").textContent =
      frag.lookupPrefix(XLINK_NS) + "\n" +
      frag.lookupPrefix(null) + "\n" +
      String(frag.lookupPrefix(XLINK_NS));
  </script>
</body>
</html>

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Node.lookupPrefix — DocumentFragment (Try It)