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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(){ $("img").attr("width",function(n, v){ return v - 50; }); }); }); </script> </head> <body> <img src="img_pulpitrock.jpg" alt="Pulpit Rock" width="284" height="213"><br> <button>Decrease image width by 50px</button> </body> </html>