Setting a height value in 'style' attribute of a table row element when height was already set to contaning 'table' or 'tbody' does nothing - table rows try to occupate all the table space (see URL for example). This behaviour has appeared after 2002-03-26 nightly. Do not know if this issue is related to bug 26617
The height on the row is considered a min height and since there is a height on the row group, the rows get extra height to honor the height on the row group. The extra height is divided among the rows which don't have a height, but in the test case all of the rows have a height so they get some extra height. wontfix.