Table borders are thin lines which can be covered up by the cell contents. The frames also do not have the proper 't' and 'x' elements. Table cell border properties are not observed correctly. Use my sample file and compare with MSIE 5. Most browsers will check 'set' value against needed and use the maximum of the two.
Tables become confused if stacked more than two levels down.
Fieldset doesn't draw container box and legend doesnt title box. This is important for visual look of form to client. Tab button does not move focus of cursor from entry to entry. Disabled form entry areas are still able to be used. Pressing reset clears radio buttons but does not clear checkbox.