HTML <col> class Attribute

The class attribute on a <col> tag assigns one or more classnames to the col element. Classes are used to style elements. Classnames are defined in a stylesheet or in a local <style> element.

Example

#

A class attribute styling a <col> element.

Id First Name Last Name Country
ART-303 Vincent Van Gogh Netherlands
ART-877 Paul Cézanne France
<style>
  table.tb { width:100%; border-collapse: collapse; }
  .tb th, .tb td { padding:3px; border: 1px solid #777; }
  .mint { background-color: mintcream; }
</style>

<table class="tb">
  <colgroup>
    <col class="mint">
    <col span="3">
  </colgroup>
  <tr> 
      <th>Id</th>
      <th>First Name</th>
      <th>Last Name</th>
      <th>Country</th>
   </tr>
   <tr> 
      <td>ART-303</td>
      <td>Vincent</td>
      <td>Van Gogh</td>
      <td>Netherlands</td>
   </tr>
   <tr> 
      <td>ART-877</td>
      <td>Paul</td>
      <td>Cézanne</td>
      <td>France</td>
   </tr>
</table>

Using class

The class attribute assigns one or more classnames to the <col> tag.

Multiple classnames are separated by a space.

Classes (i.e. classnames) are used for styling the col element.

JavaScript uses classes to access one or more elements by classname.

Tip:  class is a global attribute that can be applied to any HTML element.


Syntax

<col class="classnames" />

Values

#

Value Description
classnames One or more space-separated class names.

More Examples

A class attribute styling a <col> element.
Clicking the button toggles a classname that changes the background color.

Id First Name Last Name Country
ART-303 Vincent Van Gogh Netherlands
ART-877 Paul Cézanne France

<style>
 table.tbl { width:100%; border-collapse: collapse; }
 .tbl th, .tbl td { padding:3px; border: 1px solid #777; }
 .col-mint { background: mintcream; }
 .col-blue { background: lightblue; }
</style>

<table class="tbl">
  <colgroup>
    <col id="mycol" class="col-mint">
    <col span="3">
  </colgroup>
  <tr> 
      <th>Id</th>
      <th>First Name</th>
      <th>Last Name</th>
      <th>Country</th>
   </tr>
   <tr> 
      <td>ART-303</td>
      <td>Vincent</td>
      <td>Van Gogh</td>
      <td>Netherlands</td>
   </tr>
   <tr> 
      <td>ART-877</td>
      <td>Paul</td>
      <td>Cézanne</td>
      <td>France</td>
   </tr>
</table>

<br/>
<button onclick="toggle();">Toggle class</button>

<script>
  let toggle = () => {
    let col = document.getElementById("mycol");
    col.classList.toggle("col-blue");
  }
</script>

Code explanation

Two CSS classes are defined in the <style> element.

The class attribute in <col> assigns one classname.

Repeatedly clicking the button toggles the second class, changing the background color of the element.


Browser support

Here is when class support started for each browser:

Chrome
1.0 Sep 2008
Firefox
1.0 Sep 2002
IE/Edge
1.0 Aug 1995
Opera
1.0 Jan 2006
Safari
1.0 Jan 2003

You may also like

 Back to <col>
Guides