When you're developing web apps for mobile devices, you usually don't want the iOS/Android to auto correct or auto capitalize all your inputs, like user name or e-mail. To disable these features, you can use:

<input type="text" autocorrect="off" autocapitalize="off" autocomplete="off" />

The autocorrect and autocapitalize attributes works on the iPhone or the iPad, and the autocomplete is for any device running Android.