Evaluated as the format string argument of a sprintf() expression. The format string incorporates the other parameters by numbered token. %1$s is expanded to the value of the ‘menu_id’ parameter, **%2$s is expanded to the value of the ‘menu_class’ parameter**, and %3$s is expanded to the value of the list items. **If a numbered token is omitted from the format string, the related parameter is omitted from the menu markup**.
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*May or may not contain any actual "CSS" or "Tricks".