Source : Free On-Line Dictionary of Computing

XML User-Interface Language
     
         (XUL) An {XML}-based language created for the
        {Mozilla} {browser} for development of {cross-platform} {user
        interfaces}.  XUL supports input {controls} such as
        {textboxes} and {checkboxes}, {toolbars}, {menus}, {dialogs},
        {trees}, {keyboard shortcuts}, and more.
     
        {XULPlanet (http://www.xulplanet.com/)}.
     
        (2003-06-14)