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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> function changeSize() { $(this).animate({fontSize: "+=10px"}); } function changeSpacing() { $(this).animate({letterSpacing: "+=5px"}); } $(document).ready(function(){ $("p").on("click", changeSize); $("p").on("click", changeSpacing); $("button").click(function(){ $("p").off("click", changeSize); }); }); </script> </head> <body> <p>This is a paragraph.</p> <p>This is another paragraph.</p> <p>Click any p element to increase size and letterspacing.</p> <button>Remove the changeSize() event handler</button> </body> </html>