Have you ever tried to use the graphics class to draw a rectangle with a lineStyle (stroke) and then set bigger width and height values for the container that holds the graphic? If so, you probably noticed that there is a size difference between a rectangle with lineStyle and a rectangle without lineStyle.

If you trace the width and height values of the container, everything seems to be fine. Only if you run and look at the SWF you’ll notice a visual difference between those two (top image).