This page shows a difference between IE and Netscape 6 rendering of tables / cells with heights expressed in percentages.

The table A below has two cells. Cell A1 contains an invisible image to make the cell fairly tall. Cell A2 has a height attribute of 100%, and contains another table, table B.

Table B has two cells, B1 and B2. B1 has a fixed pixel height of 30 pixels. B2 has a height of 100%. In IE, this causes B2 to stretch to fill the entire height of cell A2, while in Netscape 6 / Gecko, it seems to have no impact on the height of cell A2.

Cell A1 |
Cell B1
Cell B2