NOTE: NOT SURE HOW USEFUL THIS IS AS IT USES JAVASCRIPT, IN WHICH CASE YOU CAN TOGLLE SHOW WITH SOME VERSION OF:
jQuery(".triggerContent").click(function() {
jQuery(this).next(".elementToHideOrShow").slideToggle("slow");
jQuery(this).find(".arrow").toggleClass("arrowUpForContentShown");
});
BUT I INCLUDE THIS AS A TUTORIAL FOR transition-behavior: allow discrete anyway