HTML <em> class Attribute

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

Example

#

A class attribute styling an <em> element.

Many of Matisse's paintings from 1898 to 1901 make use of a Divisionist technique. Divisionism is a paint style that is defined by the separation of colors into individual dots which interact optically.

<style>
  .text-em { font-weight: bold; color: teal; }
</style>

<article>
  <p>
   Many of Matisse's paintings from 1898 to 1901 make use 
   of a <em class="text-em">Divisionist</em> technique.
   Divisionism is a paint style that is defined by the separation
   of colors into individual dots which interact optically.
  </p>
</article>

Using class

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

Multiple classnames are separated by a space.

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

<em class="classnames">

Values

#

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

More Examples

A class attribute styling an <em> element.
Clicking the button toggles a classname that adds a text underline.

Many of Matisse's paintings from 1898 to 1901 make use of a Divisionist technique. Divisionism is a paint style that is defined by the separation of colors into individual dots which interact optically.

<style>
  .em-teal { font-weight: bold;  color: teal; }
  .em-underline { text-decoration: underline; }
</style>

<article>
  <p>
    Many of Matisse's paintings from 1898 to 1901 make use 
    of a <em id="myem" class="em-teal">Divisionist</em> technique.
    Divisionism is a paint style that is defined by the separation
    of colors into individual dots which interact optically.
  </p>
</article>

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

<script>
  let toggle = () => {
    let element = document.getElementById("myem");
    element.classList.toggle("em-underline");
  }
</script>

Code explanation

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

The class attribute in the <em> tag assigns one classname.

Clicking the button toggles another class which changes the element's text underline.


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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