An accessibility method is performed by an electronic device with a display and a touch-sensitive surface. The method includes: displaying a plurality of user interface elements on the display; in response to detecting a first user interface navigation gesture by a finger on the touch-sensitive surface, navigating in the plurality of user interface elements in accordance with a current navigable unit type; in response to detecting a first user interface navigation setting gesture on the touch-sensitive surface: changing the current navigable unit type from the first navigable unit type to a second navigable unit type; and outputting accessibility information about the second navigable unit type; after changing the current navigable unit type, in response to detecting a second user interface navigation gesture by the finger on the touch-sensitive surface, navigating in the plurality of user interface elements in accordance with the current navigable unit type.