Test that calling setAttributeNS() throws an error when http://www.w3.org/TR/dom/#dom-element-setattributens says it should. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS elem.setAttributeNS(null, 'foo:bar', 'baz') threw exception NamespaceError: The operation is not allowed by Namespaces in XML.. PASS elem.setAttributeNS('http://www.w3.org/XML/1998/namespace', 'xml:abc', 'foo') did not throw exception. PASS elem.setAttributeNS('http://www.w3.org/not-XML/1998/namespace', 'xml:abc', 'foo') threw exception NamespaceError: The operation is not allowed by Namespaces in XML.. PASS elem.setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns', 'http://wwww.example.org') did not throw exception. PASS elem.setAttributeNS('http://www.w3.org/2000/not-xmlns/', 'xmlns', 'http://wwww.example.org') threw exception NamespaceError: The operation is not allowed by Namespaces in XML.. PASS elem.setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:abc', 'http://wwww.example.org') did not throw exception. PASS elem.setAttributeNS('http://www.w3.org/2000/not-xmlns/', 'xmlns:abc', 'http://wwww.example.org') threw exception NamespaceError: The operation is not allowed by Namespaces in XML.. PASS elem.setAttributeNS('http://www.w3.org/2000/xmlns/', 'badprefix:xmlns', 'http://wwww.example.org') threw exception NamespaceError: The operation is not allowed by Namespaces in XML.. PASS elem.setAttributeNS('http://www.w3.org/2000/xmlns/', 'notxmlns', 'http://wwww.example.org') threw exception NamespaceError: The operation is not allowed by Namespaces in XML.. PASS successfullyParsed is true TEST COMPLETE