Casting a spell on English | Macmillan
Typographical errors have more than one category. There are miskeyings, such as form instead of from, or hte instead of the. And there are genuine spelling errors such as seperate for separate, which are the result of people actually believing that seperate is correct. Some proprietary word processing software comes with built-in detectors for spotting and correcting items such as abscence and talkign.