This example sets the SPAN attribute of the col object to two, which causes the col to span two columns. The text is right-aligned in these two columns.
<TABLE BORDER> <COLGROUP> <COL SPAN=2 ALIGN=RIGHT> <COL ALIGN=LEFT> <TBODY> <TR> <TD>This is the first column in the group, and it is right-aligned.</TD> <TD>This is the second column in the group, and it is right-aligned.</TD> <TD>This is the third column in the group, and it is left-aligned.</TD> </TR> </TABLE>
The span property is ignored when set on the colGroup element and colGroup contains one or more col elements. The span property provides a more convenient way of grouping columns without having to specify col objects.
Microsoft Developer Network: [Windows Internet Explorer API reference Article]