http://www.macedition.com/cb/ie5macbugs/

For those still trying to get your page to show up correctly in Mac IE5x, this is the page for you... a collection of odd, ugly or buggy behaviours with CSS in Internet Explorer 5.x for the Mac. Even though this IE5 mac has pretty good support for CSS1 and CSS2, some things simply do not work correctly, or can cause trouble down the road: absolute positioning, overflow, floats,...