> I cleaned up the css, removing the position: absolute,
> layer-background-color, and padding, as well as adding a
> standards-triggering doctype, and the height of the test div was in
> fact dependant on the width of the browser window in IE 5.1 mac.
Thanks for the detective work, as disappointing as the results are. It
sounds as though the html element has a square canvas in IE 5/Mac, whether
or not that canvas is fully visible.
But let me ask: what happens in IE 5/Mac when you remove the html
element from the style declaration, so that only the body element (in
addition to the div) is assigned a height of 100%?