HTML <legend> id Attribute

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

Example

#

An id attribute on a <legend>.

Customer Information






<form action="/tutorial/action.html">
  <fieldset>
    <legend id="customer-legend">Customer Information</legend>

    <input type="text" placeholder="First Name" name="firstname"><br /><br />
    <input type="text" placeholder="Last Name" name="lastname"><br /><br />
    <input type="text" placeholder="City" name="city"><br /><br />
    
   
    <input type="checkbox" id="insurance" name="requiresinsurance" value="yes">
    <label for="insurance"> &nbsp; Requires Insurance</label><br />

    <input type="submit" value="Submit">
  </fieldset>
</form>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<legend id="identifier" />

Values

#

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

More Examples

A <legend> tag with a unique id.
Clicking the button under the form will display the legend text.

Customer Information







<section>
  <form action="/tutorial/action.html">
    <fieldset>
      <legend id="mylegend">Customer Information</legend>
    
      <input type="text" placeholder="First Name" name="fname"><br /><br />
      <input type="text" placeholder="Last Name" name="lname"><br /><br />
      <input type="text" placeholder="Email" name="email"><br /><br />
      
     
      <input type="checkbox" id="needinsurance" name="needsinsurance" value="yes">
      <label for="needinsurance"> &nbsp; Needs Insurance</label><br />
    
      <input type="submit" value="Submit">
    </fieldset>
  </form>
</section>

<br/>
<button onclick="show();">Show legend</button>

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

Code explanation

The id attribute assigns a unique identifier to the <legend> element.

Clicking the button calls JavaScript which locates the <legend> using the id.

Finally, the content of the <legend> 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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