Таблицы. Атрибут "rules"

border="1"
rules="none" rules="rows" rules="cols" rules="all"
1 2 3
4 5 6
7 8 9
1 2 3
4 5 6
7 8 9
1 2 3
4 5 6
7 8 9
1 2 3
4 5 6
7 8 9