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 pixel measurement units only. This is regardless of the settings of the measurement units in the CSS attribute. Refer to the style.posBottom property for a more generalized value that can be operated on with different measurement units.