question: @ Override public void removeAttributeNS ( String namespaceURI , String localName ) { if ( ownerDocument . errorChecking && isReadOnly ( ) ) { String msg = DOMMessageFormatter . formatMessage ( DOMMessageFormatter . DOM_DOMAIN , "NO_MODIFICATION_ALLOWED_ERR" , null ) ; throw new DOMException ( DOMException . NO_MODIFICATION_ALLOWED_ERR , msg ) ; } if ( needsSyncData ( ) ) { synchronizeData ( ) ; } if ( attributes == null ) { return ; } attributes . safeRemoveNamedItemNS ( namespaceURI , localName ) ; }
target:  Introduced in DOM Level 2. <p> <p/> Removes an attribute by local name and namespace URI. If the removed attribute has a default value it is immediately replaced. The replacing attribute has the same namespace URI and local name, as well as the original prefix.<p>