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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(){ var txt = ""; txt += "Document width/height: " + $(document).width(); txt += "x" + $(document).height() + "\n"; txt += "Window width/height: " + $(window).width(); txt += "x" + $(window).height(); alert(txt); }); }); </script> </head> <body> <button>Display dimensions of document and window</button> </body> </html>