Use W3C documentation for the XHTML1.1 table model. (http://www.w3.org/TR/xhtml-modularization/abstract_modules.html#s_tablemodule)
The number of columns that will share the <col> or <colgroup> element’s attributes
Value | Meaning |
---|---|
A counting number | How many columns will have the same attributes, for example, “ 3 ” |
Default value: 1 (The attributes are for this column only.) |