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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>vs getNamedItem</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 viaNS = map.getNamedItemNS("http://www.example.com/ob", "one");
    var viaName = map.getNamedItem("ob:one");
    document.getElementById("out").textContent = (viaNS ? viaNS.value : "null") + " " + (viaName ? viaName.value : "null");
  </script>
</body>
</html>

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NamedNodeMap.getNamedItemNS() — vs getNamedItem (Try It)