Column span & row span
The table column can be spanned in horizontal direction by colspan = "VALUE", the table row can be spanned by rowspan = "VALUE" in vertical direction. Both can be specified at the same time.

This is an example of a column span in a table.

1-1 1-2 1-3 1-4
number-columns-spanned: 2 2-3 2-4
number-columns-spanned: 3 3-4
number-columns-spanned: 4
5-1 number-columns-spanned: 2 5-4

This is an example of a row span in a table.

1-1 number-rows-spanned: 2 number-rows-spanned: 5 1-4
2-1 number-rows-spanned: 3
3-1 3-2
4-1 4-2
5-1 5-2 5-4

This is an example of a row span and column span in a table.

1-1 number-columns-spanned: 2
number-rows-spanned: 2
1-4
2-1 2-4
3-1 3-2 3-3 3-4
4-1 number-columns-spanned: 3
number-rows-spanned: 2
5-1