The various position dimensions of the offsetleft,.offsetleft element are wide and high

Element. Offsetleft[top]: Read-only property the distance from the current element to the location parent (offset value) to the offsetparent of the current element

If no parent is located
OffsetParent, Body
HTML offsetleft

If you have a location parent
IE7: If you do not have a position, then Offsetleft[top] is the distance to the body
If you have a position, it is the distance to locate the parent
Other: Distance to target parent

The various position dimensions of the offsetleft,.offsetleft element are wide and high