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  |     |

+-----+-----+