15. The method of claim 9 , including, after storing the user-adjusted target text display size and prior to detecting a third input indicating the respective insertion point in the document, exiting a document-editing mode and displaying the document at the first magnification level.
9. A method, comprising: at an electronic device with a display: displaying at least a portion of an electronic document at a first magnification level on the display; detecting a first input indicating a first insertion point in the document, wherein the first insertion point is proximate to a first portion of text in the document; in response to detecting the first input: selecting a second magnification level different from the first magnification level, wherein the second magnification level is selected so as to display the first portion of text at a default target text display size; and displaying a portion of the document at the second magnification level; detecting a second input corresponding to a request to display a portion of the document at a third magnification level different from the second magnification level; in response to detecting the second input: displaying the portion of the document at the third magnification level; and storing a user-adjusted target text display size corresponding to a text display size of the first portion of text at the third magnification level, wherein the user-adjusted target text display size is different from the default target text display size; and after storing the user-adjusted target text display size: detecting a third input indicating a second insertion point in the document, wherein the second insertion point is proximate to a second portion of text in the document; and in response to detecting the third input, displaying the document at a respective magnification level such that the second portion of text is displayed at the user-adjusted target text display size.