Get computed border width
<html> <head> <script type="text/javascript"> var djConfig = { baseScriptUri : "js/dojo/" }; </script> <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script> <script> function doOnLoad() { var o = dojo.byId("myDiv"); alert(dojo.getComputedStyle(o).borderWidth); } </script> </head> <body onLoad="doOnLoad();"> <div style="border-width:10px;" id="myDiv">I am myDiv</div> </body> </html>