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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 += "Width of div: " + $("#div1").width() + "</br>"; txt += "Height of div: " + $("#div1").height(); $("#div1").html(txt); }); }); </script> <style> #div1 { height: 100px; width: 300px; padding: 10px; margin: 3px; border: 1px solid blue; background-color: lightblue; } </style> </head> <body> <div id="div1"></div> <br> <button>Display dimensions of div</button> <p>width() - returns the width of an element.</p> <p>height() - returns the height of an element.</p> </body> </html>