Checks that attributes created setAttributeNS() don't cause two identical xmlns attributes to be serialized On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS doc.documentElement.getAttributeNS("http://www.example.com", "attr") is "value" PASS parsedDoc.documentElement.getAttributeNS("http://www.example.com", "attr") is "value" PASS successfullyParsed is true TEST COMPLETE