HTML <col> id Attribute

The id attribute on a <col> tag assigns an identifier to the col element. The identifier must be unique across the page.

Example

#

And id attribute on 2 <col> elements.

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; }
  .mintcream { background: mintcream; }
</style>

<table class="tb">
  <colgroup>
    <col id="col1" class="mintcream">
    <col id="col3" 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 id

The id attribute assigns an identifier to the <col> element.

The identifier must be unique across the page.

The id allows programmatic access to the <col> element.

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


Syntax

<col id="identifier" />

Values

#

Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([aside-Zaside-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

A <col> tag with a unique id.
Clicking the button toggles its 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-turq { background: paleturquoise; }
</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 background</button>

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

Code explanation

The id attribute assigns a unique identifier to the col.

Clicking the button calls JavaScript which locates the col using the id.

It then changes the column background color by chaging the classname.


Browser support

Here is when id 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

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