What is claimed is:1. A method, comprising:at an electronic device with a display and a touch-sensitive surface:concurrently displaying, on the display, a content region, a plurality of controls, and a text input field that includes text entered by a user;while concurrently displaying the content region, the plurality of controls, and the text input field that includes text entered by the user, detecting a user input to scroll content displayed in the content region;in response to detecting the user input to scroll the content displayed in the content region:scrolling the content displayed in the content region;reducing a size of the text entered by the user; andceasing to display the plurality of controls.2. The method of claim 1, wherein the plurality of controls are displayed on a first side of the content region, and the text input field is displayed on a second side of the content region opposite the first side of the content region.3. The method of claim 1, wherein:the user input to scroll the content is a first user input to scroll the content in a first direction; andthe method further includes:after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls, receiving a second user input to scroll the content in a second direction opposite the first direction; andin response to the second user input to scroll the content in the second direction opposite the first direction:scrolling the content in the second direction opposite the first direction; andexpanding the size of the text entered by the user.4. The method of claim 1, wherein:the user input to scroll the content is a first user input to scroll the content in a first direction; andthe method further includes:after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls, receiving a second user input to scroll the content in a second direction opposite the first direction; andin response to the second user input to scroll the content in the second direction opposite the first direction:scrolling the content in the second direction opposite the first direction; anddisplaying the plurality of controls.5. The method of claim 1, further including, after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls:detecting a tap gesture at a location on the touch-sensitive surface corresponding to the text entered by the user; andin response to the tap gesture at the location on the touch-sensitive surface corresponding to the text entered by the user, expanding the size of the text entered by the user.6. The method of claim 1, further including, after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls:detecting a tap gesture at a first location on the touch-sensitive surface corresponding to the text entered by the user; andin response to the tap gesture at the first location on the touch-sensitive surface corresponding to the text entered by the user, displaying the plurality of controls.7. The method of claim 6, further including:after displaying the plurality of controls in response to the tap gesture, detecting a second tap gesture at a second location on the touch-sensitive surface corresponding to the text entered by the user; andin response to detecting the second tap gesture, displaying a virtual keyboard for editing the text.8. The method of claim 7, wherein the virtual keyboard is displayed without scrolling the content.9. A non-transitory computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display and a touch-sensitive surface, cause the electronic device to:concurrently display, on the display, a content region, a plurality of controls, and a text input field that includes text entered by a user;while concurrently displaying the content region, the plurality of controls, and the text input field that includes text entered by the user, detect a user input to scroll content displayed in the content region;in response to detecting the user input to scroll the content displayed in the content region:scroll the content displayed in the content region;reduce a size of the text entered by the user; andcease to display the plurality of controls.10. The computer readable storage medium of claim 9, wherein the plurality of controls are displayed on a first side of the content region, and the text input field is displayed on a second side of the content region opposite the first side of the content region.11. The computer readable storage medium of claim 9, wherein:the user input to scroll the content is a first user input to scroll the content in a first direction; andthe one or more programs include instructions, which when executed by the electronic device, cause the electronic device to:after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls, receive a second user input to scroll the content in a second direction opposite the first direction; andin response to the second user input to scroll the content in the second direction opposite the first direction:scroll the content in the second direction opposite the first direction; andexpand the size of the text entered by the user.12. The computer readable storage medium of claim 9, wherein:the user input to scroll the content is a first user input to scroll the content in a first direction; andthe one or more programs include instructions, which when executed by the electronic device, cause the electronic device to:after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls, receive a second user input to scroll the content in a second direction opposite the first direction; andin response to the second user input to scroll the content in the second direction opposite the first direction:scroll the content in the second direction opposite the first direction; anddisplay the plurality of controls.13. The computer readable storage medium of claim 9, wherein the one or more programs include instructions, which when executed by the electronic device, cause the electronic device to, after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls:detect a tap gesture at a location on the touch-sensitive surface corresponding to the text entered by the user; andin response to the tap gesture at the location on the touch-sensitive surface corresponding to the text entered by the user, expand the size of the text entered by the user.14. The computer readable storage medium of claim 9, wherein the one or more programs include instructions, which when executed by the electronic device, cause the electronic device to, after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls:detect a tap gesture at a first location on the touch-sensitive surface corresponding to the text entered by the user; andin response to the tap gesture at the first location on the touch-sensitive surface corresponding to the text entered by the user, display the plurality of controls.15. The computer readable storage medium of claim 14, wherein the one or more programs include instructions, which when executed by the electronic device, cause the electronic device to:after displaying the plurality of controls in response to the tap gesture, detect a second tap gesture at a second location on the touch-sensitive surface corresponding to the text entered by the user; andin response to detecting the second tap gesture, display a virtual keyboard for editing the text.16. The computer readable storage medium of claim 15, wherein the virtual keyboard is displayed without scrolling the content.17. An electronic device, comprising:a display and a touch-sensitive surface;one or more processors;memory; andone or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:concurrently displaying, on the display, a content region, a plurality of controls, and a text input field that includes text entered by a user;while concurrently displaying the content region, the plurality of controls, and the text input field that includes text entered by the user, detecting a user input to scroll content displayed in the content region;in response to detecting the user input to scroll the content displayed in the content region:scrolling the content displayed in the content region;reducing a size of the text entered by the user; andceasing to display the plurality of controls.18. The electronic device of claim 17, wherein the plurality of controls are displayed on a first side of the content region, and the text input field is displayed on a second side of the content region opposite the first side of the content region.19. The electronic device of claim 17, wherein:the user input to scroll the content is a first user input to scroll the content in a first direction; andthe one or more programs include instructions for:after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls, receiving a second user input to scroll the content in a second direction opposite the first direction; andin response to the second user input to scroll the content in the second direction opposite the first direction:scrolling the content in the second direction opposite the first direction; andexpanding the size of the text entered by the user.20. The electronic device of claim 17, wherein:the user input to scroll the content is a first user input to scroll the content in a first direction; andthe one or more programs include instructions for:after scrolling the content displayed in the content region, reducing the size of the text entered by the user, and ceasing to display the plurality of controls, receiving a second user input to scroll the content in a second direction opposite the first direction; andin response to the second user input to scroll the content in the second direction opposite the first direction:scrolling the content in the second direction opposite the first direction; anddisplaying the plurality of controls.