5. The device of claim 1 , including instructions for: while displaying the insertion marker at the second position in the text of the electronic document: detecting a vertical gesture on the touch-sensitive surface; in response to a determination that the vertical gesture satisfies a third set of one or more predefined conditions: translating the electronic document on the display in accordance with a direction of the vertical gesture, and maintaining the insertion marker at the second position in the text; and, in response to a determination that the vertical gesture satisfies a fourth set of one or more predefined conditions that is distinct from the third set of one or more predefined conditions, moving the insertion marker from a line in the text containing the second position to a vertically adjacent line in the text in accordance with the direction of the vertical gesture.
5. The device of claim 1 , including instructions for: while displaying the insertion marker at the second position in the text of the electronic document: detecting a vertical gesture on the touch-sensitive surface; in response to a determination that the vertical gesture satisfies a third set of one or more predefined conditions: translating the electronic document on the display in accordance with a direction of the vertical gesture, and maintaining the insertion marker at the second position in the text; and, in response to a determination that the vertical gesture satisfies a fourth set of one or more predefined conditions that is distinct from the third set of one or more predefined conditions, moving the insertion marker from a line in the text containing the second position to a vertically adjacent line in the text in accordance with the direction of the vertical gesture. 8. The device of claim 5 , wherein the fourth set of one or more predefined conditions includes that the vertical gesture is a single-finger gesture.