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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(window).resize(function() { if ($(this).width() < 728) { $("body").css("background-color", "yellow"); } else { $("body").css("background-color", "pink"); } }); }); </script> </head> <body> <p>Resize the window to change background-color (make the screen's width smaller and larger).</p> </body> </html>