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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").css("border-width", function(i){ return i + 25; }); }); }); </script> </head> <body> <button>Change the border-width property of the p element</button> <p style="border: 1px solid black;">This is a paragraph.</p> </body> </html>