HTML <dt> class Attribute

The class attribute on a <dt> tag assigns one or more classnames to the description term 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 <dt> element with italic text.

Kunstmuseum
Basel, Switzerland
National Gallery of Art
Washington DC, USA
Musée d'Orsay
Paris, France
<style>
  .dt-italic { font-style: italic; }
</style>

<dl>
  <dt class="dt-italic">Kunstmuseum</dt>
  <dd>Basel, Switzerland</dd> 
  <dt class="dt-italic">National Gallery of Art</dt>
  <dd>Washington DC, USA</dd>
  <dt class="dt-italic">Musée d'Orsay</dt>
  <dd>Paris, France</dd>
</dl>

Using class

The class attribute assigns one or more classnames to the <dt> tag.
The text is italic.

Multiple classnames are separated by a space.

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

<dt class="classnames">

Values

#

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

More Examples

A class attribute styling a <dt> element. The text is italic.
Clicking the button toggles a classname that changes the background color for all <dt> elements.

1. Kunstmuseum
Basel, Switzerland
2. National Gallery of Art
Washington DC, USA
3. Musée d'Orsay
Paris, France

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

<dl>
  <dt class="dt-italic">1. Kunstmuseum</dt>
  <dd>Basel, Switzerland</dd> 
  <dt class="dt-italic">2. National Gallery of Art</dt>
  <dd>Washington DC, USA</dd>
  <dt class="dt-italic">3. Musée d'Orsay</dt>
  <dd>Paris, France</dd>
</dl>

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

<script>
  let toggle = () => {
    let elements = document.getElementsByClassName("dt-italic");
    [].forEach.call(elements, element => element.classList.toggle("dt-lavender"));
  }
</script>

Code explanation

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

The class attributes assigned all <dt> elements one classname.

Clicking the button retrieves all <dt> elements using the classname.

JavaScript then iterates over the elements and toggles another class which changes the background color.


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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