HTML <col> style Attribute

HTML <code>

HTML <colgroup>

A style attribute on a <col> tag assigns a unique style to the col element.

Its value is CSS that defines the appearance of the col element.

Example

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A style attribute on a <col> tag.

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; }
</style>

<table class="tb">
  <colgroup>
    <col>
    <col span="3" style="background-color:mintcream;">
  </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 style

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The style attribute specifies the style, i.e. look and feel, of the <col> element.

A style contains any number of CSS property/value pairs, separated by semicolons (;).

The style attribute overrides any other style that was defined in a <style> tag or an external CSS file.

This inline styling affects the current <col> element only.

Syntax

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<col style="CSS-styles">

Values

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Value	Description
CSS-styles	One or more CSS property/value pairs separated by semicolons (;).

More Examples

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A style attribute on a <col> tag.
Clicking the button toggles 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; }
</style>

<table class="tbl">
  <colgroup>
    <col>
    <col span="3" id="mycol" style="background-color:mintcream;">
  </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 style</button>

<script>
  let toggle = () => {
    let element = document.getElementById("mycol");

    if (element.style.backgroundColor === "mintcream") {
       element.style.backgroundColor = "papayawhip";
    } else {
       element.style.backgroundColor = "mintcream";
    }
  }
</script>

Code explanation

The style attribute assigns a background color to the <col> element.

When clicking the button JavaScript changes the element background color.

Browser support

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Here is when style support started for each browser: