Test for chromium bug : 396655. Tables with specific merge cell configuration render with extra height to tr elements.
We have the below table. Because cell A and cell D overlap in the second row, the height of the second row is the 1px difference between A and B and the 1px difference between C and D.
+-----+-----+
| | B |
| A +-----+
| | |
+-----+ D |
| C | |
+-----+-----+
PASS
PASS
PASS