Revert the most recent 'destructive' operation, changing the set of matched elements to its previous state (right before the destructive operation). If there was no destructive operation before, an empty set is returned. A 'destructive' operation is any operation that changes the set of matched jQuery elements. These functions are: <code>add</code>, <code>children</code>, <code>clone</code>, <code>filter</code>, <code>find</code>, <code>not</code>, <code>next</code>, <code>parent</code>, <code>parents</code>, <code>prev</code> and <code>siblings</code>. Selects all paragraphs, finds span elements inside these, and reverts the selection back to the paragraphs. <p><span>Hello</span>, how are you?</p> $("p").find("span").end(); [ <p>...</p> ]