col elementcolgroup element that doesn't have a
span attribute.spanHTMLTableColElement, same as
for colgroup elements. This interface
defines one member, span.
If a col element has a parent and that is a
colgroup element that itself has a
parent that is a table element, then the col element represents
one or more columns in the column group represented by that
colgroup.
The element may have a span content attribute
specified, whose value must be a valid non-negative integer
greater than zero.