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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("p").mouseover(function(){ $("p").css("background-color", "yellow"); }); $("p").mouseout(function(){ $("p").css("background-color", "lightgray"); }); $("#btn1").click(function(){ $("p").mouseover(); }); $("#btn2").click(function(){ $("p").mouseout(); }); }); </script> </head> <body> <p>Move the mouse pointer over this paragraph.</p> <button id="btn1">Trigger mouseover event</button><br> <button id="btn2">Trigger mouseout event</button> </body> </html>