"Think of it this way: during a sporting event, whenever the home team scores, the crowd will cheer. You don’t know exactly when during a game the team will score, but when it does, the crowd will cheer, just as predicted. The fact that you can’t predict the exact moment of the cheer doesn’t make it any less expected."
CSS: The Definitive Guide by Eric A. Meyer and Estelle Weyl, pg. 77 (O’Reilly). Copyright 2018 Eric Meyer, Estelle Weyl, 978-1-449-39319-9.