Adaptive and special user interface modes

Techniques for user interface customization of an application are described. A navigational structure file is received including a description of a hierarchical structure describing a navigational flow of the application. The hierarchical structure may include objects corresponding to different navigation points of the application whereby interaction with a user interface element causes transition or navigation from a first navigation point of the application to a second navigation point of the application as described in the hierarchical structure. It is determined whether any one of a defined set of one or more trigger conditions occurs. Responsive to determining an occurrence of a trigger condition in the defined set, first processing is performed in accordance with the trigger condition that has occurred to produce a customized user interface displayed to a user and to produce a customized navigational flow of the application.