Rather than just spotting whole mistyped words, Apple wants iOS to figure out which letters are wrong, delete those on the fly with little user intervention, and keep the right ones. It's 15 years now since Apple designer Ken Kocienda invented what would become the iPhone's on-screen keyboard. Apple has since refined it with features such as Slide to Type, and it has been filing patent after patent on autocorrection ideas. Now it's been granted yet another patent, and this one is about speeding up how we deal with typing mistakes. "Intelligently deleting back to a typographical error," is not concerned with the usual issue over spotting a mistake as you type it, although that is part of this. Currently, if you make a mistake then you can tap Delete several times to remove each letter.