HTML <em> class Attribute

HTML <dt>

HTML <embed>

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

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Classes (i.e. classnames) are used for styling the em 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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<em 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 an <em> element.
Clicking the button toggles a classname that adds a text underline.

<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

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Here is when class support started for each browser: