HTML <u> class Attribute

The class attribute on a <u> tag assigns one or more classnames to the underline text element. Classes are used to style elements. Classnames are defined in a stylesheet or in a local <style> element.

Example

#

A class attribute styling a <u> element.

This text is underlined.

<style>
  .lavender { background-color: lavender; }
</style>

<p>
  <u class="lavender">This text is underlined</u>.
</p>

Using class

The class attribute assigns one or more classnames to the <u> tag.

Multiple classnames are separated by a space.

Classes (i.e. classnames) are used for styling the u element.

JavaScript uses classes to access one or more elements by classname.

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


Syntax

<u class="classnames">

Values

#

Value Description
classnames One or more space-separated class names.

More Examples

A class attribute styling a <u> element.
Clicking the button toggles a classname that boldens the text.

This text is underlined.


<style>
  .lavender { background-color: lavender; }
  .bold { font-weight:700; }
</style>

<p>
  <u id="myu" class="lavender">This text is underlined</u>.
</p>

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

<script>
  let toggle = () => {
     let element = document.getElementById("myu");
     element.classList.toggle("bold");
  }
</script>

Code explanation

Two CSS classes are defined in the <style> element.

The class attribute in <u> assigns one classname.

Repeatedly clicking the button adds and removes another class, toggling the boldness of the <u>.


Browser support

Here is when class 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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