Using the default iOS keyboard in Safari iOS 8x and 9x when an input uses the HTML attribute autocapitalize="words" the first 2 letters of the input field are set to uppercase, I'm amazed this has been present since 8.x and has passed under the radar.
Official documentation says is supported: https://developer.apple.com/library/safari/documentation/AppleApplications/Reference/SafariHTMLRef/Articles/Attributes.html
To test, open thee following field on iOS emulator or real device:
First name: <input type="text" autocorrect="off" autocapitalize="words" value="First Name">You can use http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_form_submit to test.
Juanca