HTML <u> class Attribute

HTML <track>

HTML <ul>

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.

Example

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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

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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.

Syntax

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<u class="classnames">

Values

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

More Examples

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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

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Here is when class support started for each browser: