1. A method, comprising: at an accessible electronic device with a touch-sensitive surface and a display: mapping at least a first portion of the display to the touch-sensitive surface; concurrently displaying a plurality of user interface containers on the display; detecting a user interface container selection event that selects a first user interface container in the plurality of user interface containers; and, in response to detecting the user interface container selection event: ceasing to map the first portion of the display to the touch-sensitive surface, and proportionally mapping the first user interface container to be substantially coextensive with the touch-sensitive surface; and outputting audible accessibility information associated with the first user interface container.