Err … the [Wikipedia Manual of Style](https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style)? Much of that is about consistency in layout, formatting, typesetting, terminology, etc., but it also includes sections on things like [verb tense](https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style#Verb_tense) which have a strong impact on acceptable writing style.
Generally a consistent style is a good thing for encyclopedic content since we’re more interesting in finding things out ASAP rather than creative content.
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