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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(){ alert("Inner width of div: " + $("div").innerWidth()); }); }); </script> </head> <body> <div style="height:100px;width:300px;padding:10px;margin:3px;border:1px solid blue;background-color:lightblue;"></div><br> <button>Display the inner width of div</button> <p>innerWidth() - returns the inner width of an element (includes padding).</p> </body> </html>