Indicates how many rows the table cell is intended to span.
|DOM level - 1|
|JScript - 3.0|
|Internet Explorer - 4.0|
|Netscape - 6.0|
|Property/method value type:||Number primitive|
This is used when you want to create complex tables. This technique may be an alternative to nesting a table. That is always good because sometimes nested tables can become very unwieldy.