HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>wrong URI</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var doc = new DOMParser().parseFromString('<warning ob:one="test" xmlns:ob="http://www.example.com/ob"/>', "application/xml");
    var map = doc.documentElement.attributes;
    var name = "";
    try {
      map.removeNamedItemNS("ob", "one");
    } catch (err) {
      name = err.name;
    }
    document.getElementById("out").textContent = name;
  </script>
</body>
</html>

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NamedNodeMap.removeNamedItemNS() — wrong URI (Try It)