Get browser window width including scrollbar

The first answer was close, but upon further inspection it is a bit more complicated. The body.clientWidth is the width excluding the scrollbars. The window.outerWidth is the width including the scrollbars and other window elements like the window border. The window.innerWidth is the actual width of the window, including scrollbars, but not including the window border.

This will get the full Window's width:

 window.outerWidth

NOTE: jQuery's outerWidth() doesn’t work on $(window)