Now as we get the width of an element, jQuery will detect which box model we are using, although it does slow up the getting a lot. To keep it fast use .css('width') rather than .width() and it will just grab whichever width the css is using. A nice alternative
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jQuery Blog » jQuery 1.8 box-sizing: width(), css(“width”), and outerWidth()
One of the great new features in jQuery 1.8 is a built-in understanding of box-sizing: border-box which is supported by every modern browser. (Sorry, IE6 and IE7, please take one step back; I said mod…