HTML <caption> id Attribute

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

Example

#

An id attribute on a <caption>.

Artists
Firstname Lastname Country
Vincent Van Gogh Netherlands
Paul Cézanne France
<style>
 table.tb { width:100%; border-collapse: collapse; }
 .tb th, .tb td { padding:3px; border: 1px solid #777; }
 .tb caption { background-color:lightblue; color:black; padding:5px; text-align:center; }
</style>

<table class="tb">
  <caption id="artists">Artists</caption>
  <tr> 
    <th>Firstname</th>
    <th>Lastname</th>
    <th>Country</th>
  </tr>
  <tr> 
    <td>Vincent</td>
    <td>Van Gogh</td>
    <td>Netherlands</td>
  </tr>
  <tr> 
    <td>Paul</td>
    <td>Cézanne</td>
    <td>France</td>
  </tr>
</table>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<caption 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 <caption> with a unique id.
Clicking the button will display the caption's text.

Artists
Firstname Lastname Country
Vincent Van Gogh Netherlands
Paul Cézanne France

<section>
  <style>
    table.tb { width:100%; border-collapse: collapse; }
    .tb th, .tb td { padding:3px; border: 1px solid #777; }
    .tb caption { background-color:lightblue; color:black; padding:5px; }
  </style>
  
  <table class="tb">
    <caption id="mycaption">Artists</caption>
    <tr> 
      <th>Firstname</th>
      <th>Lastname</th>
      <th>Country</th>
    </tr>
    <tr> 
      <td>Vincent</td>
      <td>Van Gogh</td>
      <td>Netherlands</td>
    </tr>
    <tr> 
      <td>Paul</td>
      <td>Cézanne</td>
      <td>France</td>
    </tr>
  </table> <br/>
 
  <button onclick="show();">Show caption</button>
</section>

<script>
  let show = () => {
     let element = document.getElementById("mycaption");
     alert("Caption = " + element.innerHTML);
  }
</script>

Code explanation

The id attribute assigns a unique identifier to the caption.

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

Finally, the content of the caption is displayed in an alert box.


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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