Onto – English editing.

The preposition onto meaning ‘to a position on the surface of’, as in they fell off their stools onto the rough stone floor , has been widely written as one word(instead of on to)since the early 18th century. Some people, however , still do not wholly accept it as part of the standard English language. (unlike into, for example). In US English, onto is more or less the standard form and this is likely to become the case in British English before long.
Because of the increasing tendancy to write the two words as one,it is important to remember never to write onto as one wordwhen it means ‘onwards and towards’, as in let’s go on to the next point.
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