This object was added in version 5 of MSIE to complete the set of positioning properties already available with the style object in earlier versions of MSIE.
Objects can be positioned on screen with this property. This value defines the location of the bottom edge of a styled element. The bottom edge includes padding, borders and margins around the object as well as its content. The position is located with reference to the next outermost (parent) container.
This property will be useful as an alternative to the style.bottom property, which includes the measurement units when a value is read back from it.
The value in this property will be an integer defined in the measurement units defined by the CSS attribute. Refer to the style.pixelBottom property for a more specialized value that can be operated on unambiguously in pixel measurement units.