According to Kuo, the iPhone 8 will feature a 5.8-inch display, but with a strip along the bottom of the display reserved for a “function area.” Details on exactly what the function area will be used for are unclear, but it will likely be some sort of dock-like area that could include fingerprint sensing, Home button functionality, and likely other dynamic icons and buttons for interacting with the device.

While Kuo says the overall 5.8-inch display will have a resolution of 1242 x 2800 pixels, he claims the active “display area” will measure 5.15 inches diagonally with a resolution of 1125 x 2436. That’s likely the screen size that would be presented to Safari and other apps as the usable display space.
 Via