Hides each of the set of matched elements if they are shown. $("p").hide() [ <p style="display: none">Hello</p> ] <p>Hello</p> Hide all matched elements using a graceful animation and firing an optional callback after completion. The height, width, and opacity of each of the matched elements are changed dynamically according to the specified speed. A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000). (optional) A function to be executed whenever the animation completes. $("p").hide("slow"); $("p").hide("slow",function(){ alert("Animation Done."); });