When answering questions should we use the American variant of a word or the British variant, or both?
On EL&U, we have historically had no preference—each author is free to use any dialect or variety of English that they wish to. If a question specifies a dialect, then the questioner would likely want an answer that is suitable for that dialect, but beyond that, much like Wikipedia, we have not found a need to set a site manual of style.
As ELL is open to all English learners, I see no reason why the same policy should not be adopted.
No one variety is preferred, and most people don't know (well) the other varieties.So the answerer should answer with the variety they are most familiar. Others are welcome to add an answer with respect to their own variety.
If it is not obvious, some notice should be made that 'this answer is with respect to [the particular kind of] English'.
- there is no preference between British or American (or any other) English, expect by likelihood (New Zealand English probably doesn't have the numbers).
- both in one answer is difficult to know well, but all varieties are welcome
- the answerer should be welcome to edits or comments to state the variety