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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("p").fadeTo(2000, 0.2, function(){ alert("The fadeTo effect is finished!"); }); }); }); </script> </head> <body> <button>Gradually change the opacity of the p element</button> <p>This is a paragraph.</p> </body> </html>