https://github.com/tjvantoll/api.jqueryui.com/commit/f65b2de3b6160d981c0bc4edbad3d7b6ee571e9f

I changed it to just "input element" since "input" and "input element" already appear a whole lot of autocomplete's API page. And I think it makes sense too; it is the element you're inputting into.

I put a sentence at the beginning because the textarea or contenteditable information is not mentioned anywhere currently.