HTML <code> id Attribute

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

Example

#

An id attribute on a <code> tag.

In JavaScript the alert() method displays an alert box.

<p>
  In JavaScript the <code id="alert-code">alert()</code> 
  method displays an alert box.
</p>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<code id="identifier">

Values

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


More Examples

A <code> tag with a unique id.
Clicking the button will toggle the boldness of the code.

In JavaScript the alert() method displays an alert box.


<p>
  In JavaScript the <code id="mycode">alert()</code> 
  method displays an alert box.
</p><br/>

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

<script>
  let toggle = () => {
     let element = document.getElementById("mycode");
     
     if (element.style.fontWeight === "bold") {
        element.style.fontWeight = "normal";
     } else {
        element.style.fontWeight = "bold";
     }
  }
</script>

Code explanation

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

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

It then toggles a bold style on the <code> element.


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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