Verify the functionality of the rowspan attribute for TD and TH.
Test for assertion 11.2.6-6

In the following table, TD is used to specify table cells.

The cell labeled "default" must span one row because no value is specified for the rowspan attribute, but 1 is the default value.
The cell labeled "zero" must span THREE ROWS because the rowspan attribute is set to 0. The 0 value means that the cell spans all rows from the current row to the last row of the table section in which the cell is defined.
The cell labeled "one" must span one row because the rowspan attribute is set to 1.
The cell labeled "two" must span two rows because the rowspan attribute is set to 2.
The cell labeled "three" must span three rows because the rowspan attribute is set to 3.
row 1defaultzero onetwo three
row 2
row 3

In the following table, TH is used to specify table cells.

The cell labeled "default" must span one row because no value is specified for the rowspan attribute, but 1 is the default value.
The cell labeled "zero" must span THREE ROWS because the rowspan attribute is set to 0. The 0 value means that the cell spans all rows from the current row to the last row of the table section in which the cell is defined.
The cell labeled "one" must span one row because the rowspan attribute is set to 1.
The cell labeled "two" must span two rows because the rowspan attribute is set to 2.
The cell labeled "three" must span three rows because the rowspan attribute is set to 3.
row 1defaultzero onetwo three
row 2
row 3