span Span (NISO JATS table model)

The number of columns that will share the <col> or <colgroup> element’s attributes. (This attribute is based on and intended to be converted easily to the XHTML span attribute.)
OPTIONAL (defaults to 1) on elements: <col>, <colgroup>
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.)
Tagged Sample

Identifying only a single column will share the same attributes

<table border="1">
  <col span="1"/>
  <col align="char" char="," charoff="50%" span="1"/>