In IE5 and IE6

1. A div is rectangular.
2. Only one corner of a div can be absolutely positioned on a page.
3. The location of the diagonally opposing corner must be determined by the width and height of the div.
4. The width and height can be determined using dynamic properties.

In all other browsers:

1. A div is rectangular.
2. All four corners of a div can be absolutely positioned on a page.
3. If the location of diagonally opposing corners has been determined, the width and height is implied.