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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(".btn1").click(function(){ $("#p1").animate({height: "+=20px"}); }); $(".btn2").click(function(){ $("#p1").animate({height: "-=20px"}); }); }); </script> </head> <body> <button class="btn1">Animate +</button> <button class="btn2">Animate -</button> <p>This is a paragraph.</p> <p id="p1" style="border:1px solid blue;">This is an animated paragraph.</p> <p>This is a paragraph.</p> </body> </html>