This element includes theglobal attributes.

span

Specifies the number of consecutive columns the<colgroup> element spans. The value must be a positive integer greater than zero. If not present, its default value is1.

Note:Thespan attribute is not permitted if there are one or more<col> elements within the<colgroup>.

The following attributes are deprecated and should not be used. They are documented below for reference when updating existing code and for historical interest only.

alignDeprecated

Specifies the horizontal alignment of each column group cell. The possibleenumerated values areleft,center,right,justify, andchar. When supported, thechar value aligns the textual content on the character defined in thechar attribute and the offset defined by thecharoff attribute. Note that the descendant<col> elements may override this value using their ownalign attribute. Use thetext-align CSS property on the<td> and<th> elements instead, as this attribute is deprecated.

Note:Settingtext-align on the<colgroup> element has no effect as<td> and<th> elements are not descendants of the<colgroup> element, and therefore they do not inherit from it.

If the table does not use acolspan attribute, use thetd:nth-of-type(an+b) CSS selector per column, wherea is the total number of the columns in the table andb is the ordinal position of the column in the table, e.g.,td:nth-of-type(7n+2) { text-align: right; } to right-align the second column cells.

If the table does use acolspan attribute, the effect can be achieved by combining adequate CSS attribute selectors like[colspan=n], though this is not trivial.

bgcolorDeprecated

Defines the background color of each column group cell. The value is an HTML color; either a6-digit hexadecimal RGB code, prefixed by a#, or acolor keyword. Other CSS<color> values are not supported. Use thebackground-color CSS property instead, as this attribute is deprecated.

charDeprecated

Does nothing. It was originally intended to specify the alignment of the content to a character of each column group cell. Typical values for this include a period (.) when attempting to align numbers or monetary values. Ifalign is not set tochar, this attribute is ignored, though it will still be used as the default value for thealign of the<col> elements which are members of this column group.

charoffDeprecated

Does nothing. It was originally intended to specify the number of characters to offset the column group cell content from the alignment character specified by thechar attribute.

valignDeprecated

Specifies the vertical alignment of each column group cell. The possibleenumerated values arebaseline,bottom,middle, andtop. Note that the descendant<col> elements may override this value using their ownvalign attribute. Use thevertical-align CSS property on the<td> and<th> elements instead, as this attribute is deprecated.

Note:Settingvertical-align on the<colgroup> element has no effect as<td> and<th> elements are not descendants of the<colgroup> element, and therefore they do not inherit from it.

If the table does not use acolspan attribute, use thetd:nth-of-type() CSS selector per column, e.g.,td:nth-of-type(2) { vertical-align: middle; } to center the second column cells vertically.

If the table does use acolspan attribute, the effect can be achieved by combining adequate CSS attribute selectors like[colspan=n], though this is not trivial.

widthDeprecated

Specifies a default width for each column in the current column group. In addition to the standard pixel and percentage values, this attribute can take the special form0*, which means that the width of each column spanned should be the minimum width necessary to hold the column's contents. Relative widths such as5* can also be used. Note that the descendant<col> elements may override this value using their ownwidth attribute. Use thewidth CSS property instead, as this attribute is deprecated.

• The<colgroup> should appear within a<table>, after any<caption> element (if used), but before any<thead>,<tbody>,<tfoot>, and<tr> elements.
• Only a limited number of CSS properties affect<colgroup>:
  • background : The variousbackground properties will set the background for cells within the column group. As the column group background color is painted on top of the table, but behind background colors applied to the columns (<col>), the row groups (<thead>,<tbody>, and<tfoot>), the rows (<tr>), and the individual cells (<th> and<td>), backgrounds applied to table column groups are only visible if every layer painted on top of them has a transparent background.
  • border: The variousborder properties apply, but only if the<table> hasborder-collapse: collapse set.
  • visibility: The valuecollapse for a column group results in all cells of the columns in that column group not being rendered, and cells spanning into other columns being clipped. The space these columns in the column group would have occupied is removed. However, the size of other columns is still calculated as though the cells in the collapsed column(s) in the column group are present. Other values forvisibility have no effect.
  • width: Thewidth property defines a minimum width for the columns within the column group, as ifmin-width were set.

See<table> for a complete table example introducing common standards and best practices.

This example demonstrates a seven-column table divided into two<colgroup> elements that span multiple columns.

Two<colgroup> elements are used to structure a basic table by creating column groups. The number of columns in each column group is specified by thespan attribute.

<table>  <caption>    Personal weekly activities  </caption>  <colgroup span="5"></colgroup>  <colgroup span="2"></colgroup>  <tr>    <th>Mon</th>    <th>Tue</th>    <th>Wed</th>    <th>Thu</th>    <th>Fri</th>    <th>Sat</th>    <th>Sun</th>  </tr>  <tr>    <td>Clean room</td>    <td>Football training</td>    <td>Dance Course</td>    <td>History Class</td>    <td>Buy drinks</td>    <td>Study hour</td>    <td>Free time</td>  </tr>  <tr>    <td>Yoga</td>    <td>Chess Club</td>    <td>Meet friends</td>    <td>Gymnastics</td>    <td>Birthday party</td>    <td>Fishing trip</td>    <td>Free time</td>  </tr></table>

Grouped columns can be used to visually highlight the structure using CSS:

table {  border-collapse: collapse;  border: 2px solid rgb(140 140 140);}caption {  caption-side: bottom;  padding: 10px;}th,td {  border: 1px solid rgb(160 160 160);  padding: 8px 6px;  text-align: center;}.weekdays {  background-color: #d7d9f2;}.weekend {  background-color: #ffe8d4;}

table {  font-family: sans-serif;  font-size: 0.8rem;  letter-spacing: 1px;}

Result

• Learn: HTML table basics
• <caption>,<col>,<table>,<tbody>,<td>,<tfoot>,<th>,<thead>,<tr>: Other table-related elements
• background-color: CSS property to set the background color of each column group cell
• border: CSS property to control borders of column group cells
• text-align: CSS property to horizontally align each column group cell content
• vertical-align: CSS property to vertically align each column group cell content
• visibility: CSS property to hide (or show) cells of a column group
• width: CSS property to control the default width for each column in a column group
• :nth-of-type,:first-of-type,:last-of-type: CSS pseudo-classes to select the desired column cells