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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(){ $("#span1").text($(window).width()); $("#span2").text($(document).width()); }); }); </script> </head> <body> <p>The width of this window is <span id="span1">unknown</span> px.</p> <p>The width of this document is <span id="span2">unknown</span> px.</p> <button>Return the width of the window and document elements</button> </body> </html>