|See also:||Canon Divergence AU, Canon|
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Canon Compliant is a term used to describe a fanfic's relationship to canon. It is applied to fanfics that are not set in an alternate universe, and is usually an indication that the fan writer made an effort to at least not contradict known canon details, plot developments, character back story, etc. However, in practice, canon compliance is more of a sliding scale and less of an absolute in fanfic, except perhaps for Canon Nazis. Fic headers often contain information about what the fic is compliant with (e.g. diverges after season 2, compliant with movie canon, etc.). Canon compliance can be difficult to achieve in open canons and in RPF fandoms, where an idea that fit with canon at the time the fan started writing could easily be contradicted by further developments by the time the story is posted.