Objects do not properly inherit the height of their parent if the parent has no explicit height. Specifying the parent's height using just 'top' and 'bottom' will not let the child object inherit a height value.
Created attachment 6385 [details] Test case which exposes the bug
Confirmed, Opera and FFox behave differently on this testcase. It could be that we match IE here, have to test that. Good testcase though.
ToT now renders the test case correctly.
Closing as this now works in ToT due to the patch from bug 9085.
Reopening to close as a duplicate.
*** This bug has been marked as a duplicate of 9085 ***