HTML col element

The <col> HTML element defines one or more columns in a column group represented by its parent <colgroup> element. The <col> element is only valid as a child of a <colgroup> element that has no span attribute defined.

The <col> element is used within a <colgroup> element that doesn’t have a span attribute. The <col> elements do not structurally group columns together. This is the role of the <colgroup> element. Only a limited number of CSS properties affect <col>: background : The various background properties will set the background for cells within the column. As the column background color is painted on top of the table and column groups (<colgroup>), but behind background colors applied to the row groups (<thead>, <tbody>, and <tfoot>), the rows (<tr>), and the individual cells (<th> and <td>), backgrounds applied to table columns are only visible if every layer painted on top of them has a transparent background. border: The various border properties apply, but only if the <table> has border-collapse: collapse set. visibility: The value collapse for a column results in all cells of that column not being rendered, and cells spanning into other columns being clipped. The space these columns would have occupied is removed.