HTML <ul> id Attribute

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

Example

#

An id attribute on a <ul> element.

  • Vincent Van Gogh
  • Paul Cézanne
  • Claude Monet
<ul id="artists">
  <li>Vincent Van Gogh</li>
  <li>Paul Cézanne</li>
  <li>Claude Monet</li>
</ul>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<ul 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 <ul> element with a unique id.
Clicking the button displays the number of list items inside the unordered list.

  • Vincent Van Gogh
  • Paul Cézanne
  • Claude Monet

<ul id="myul">
  <li>Vincent Van Gogh</li>
  <li>Paul Cézanne</li>
  <li>Claude Monet</li>
</ul>
  
<br />
<button onclick="show();">Show # artists</button>

<script>
  let show = () => {
     let element = document.getElementById("myul");
     let count = element.getElementsByTagName("li").length;
     alert("# Artists = " + count);
  }
</script>

Code explanation

The id attribute assigns a unique identifier for the <ul>.

Clicking the button calls JavaScript which locates the <ul> through the id.

It then counts the number of <li> inside the <ul> and displays it 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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