Hello, fragmentation. Resolution might be the same as iPad 2, but pixel density is different. Therefore an area that is clickable on iPad2 or iPad3 may become

Hello, fragmentation. Resolution might be the same as iPad 2, but pixel density is different. Therefore an area that is clickable on iPad2 or iPad3 may become too small to click on the iPad mini. So we had two platforms - iPad2/iPad3 with one tap area size, and iPhone 4/iPhone 5 with another, and now we have three.