COLGROUP

Used as a container for a group of columns.

ALIGN=: Displays the element left flush, right flush, or centered relative to the display or table.
CLASS=: Specifies the class of the tag being defined. This is most often used to associated a sub-classed style sheet with the tag.
ID=: An SGML identifier used as the target for hypertext links or for naming particular elements in associated style sheets. Valid names to script with are any alphanumeric string that begins with a letter. Valid special characters include underbar "_".
SPAN=: Specifies how many columns are in the group.
STYLE=: Specifies an in-line style sheet for the tag.
TITLE=: The Title attribute is used to provide advisory information.
VALIGN=: Displays the elements aligned at the top or bottom within the element.

Both the start and end tags are required.