An electronic device displays a first user interface including user interface objects. While displaying the first user interface, the device detects a first input on the touch-sensitive surface. In response, if the first input is detected at a location on the touch-sensitive surface that corresponds to a first user interface object of the first user interface and that the first input satisfies first input intensity criteria, the device performs a first operation, including displaying a zoomed-in view of at least a first portion of the first user interface; and, if the first input is detected at a location on the touch-sensitive surface that corresponds to the first user interface object of the first user interface and that the first input does not satisfy first input intensity criteria, the device performs a second operation that is distinct from the first operation.