HTMLCollection getElementsByTagNameNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString localName);
[MeasureAs=ElementGetAttributeNodeNS] Attr getAttributeNodeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
[Default=Undefined] optional DOMString localName); // Removed from DOM4.
+ [RaisesException, CustomElementCallbacks, DeprecateAs=ElementSetAttributeNodeNS] Attr setAttributeNodeNS([Default=Undefined, StrictTypeChecking] optional Attr newAttr); // Removed from DOM4.
boolean hasAttribute(DOMString name);
boolean hasAttributeNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString localName);