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<html><head><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.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>