HTML <u> class Attribute

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

Classnames are defined in a stylesheet or in a local <style> element.

Classes, i.e. classnames, are used to style elements.



A class attribute styling a <u> element.

This text is underlined.

  .lavender { background-color: lavender; }

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

Using class

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

Multiple classnames are separated by a space.

JavaScript uses classes to access elements by classname.

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


<u class="classnames">



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.

  .lavender { background-color: lavender; }
  .bold { font-weight:700; }

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

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

  let toggle = () => {
     let element = document.getElementById("myu");

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:

1.0 Sep 2008
1.0 Sep 2002
1.0 Aug 1995
1.0 Jan 2006
1.0 Jan 2003

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Author: Jack Poorte
Published: Jun 20 2021
Last Reviewed: Sep 30 2023

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