It is quite difficult to explain the problem clearly in few words. A quite look at the provided test case code makes you understand the problem. Anyway, I'll try to explain: if you have a two rows table with height set to 100%, and one of the rows (TR) height is set to 100%, that row is supposed to get as more space as available in the table height. It works well on a pure HTML case. If instead the row without height style is not displayed (display:none) and, after page load, you display it, the rows heights are not correctly calculated. The provided test case works well with IE 6, Opera 9 and Firefox 2. The code is quite simple and you will also find comments regarding a workaround for it.
Created attachment 11606 [details] Test Case
The issue seem to be fixed... Atleast the test case is working properly on r118649 onwards
Safari, Chrome, and Firefox produce the same layout for this test.