HTML <section> class Attribute

The class attribute on a <section> tag assigns one or more classnames to the section 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 <section> element.

The Night Watch

The Night Watch (Dutch: De Nachtwacht), is a 1642 painting by Rembrandt van Rijn. It is in the collection of the Amsterdam Museum but is prominently displayed in the Rijksmuseum (State Museum) as the best-known painting in its collection. The Night Watch is the most famous Dutch Golden Age painting.

<style>
  .section-class {
    background: moccasin;
    padding: 20px;
    width: 400px;
    line-height: 1.7em;
  }
</style>

<section class="section-class">
  <h2>The Night Watch</h2>
  <p>The Night Watch (Dutch: De Nachtwacht), is a 1642 
     painting by Rembrandt van Rijn. It is in the collection 
     of the Amsterdam Museum but is prominently displayed 
     in the Rijksmuseum (State Museum) as the best-known 
     painting in its collection. The Night Watch is 
     the most famous Dutch Golden Age painting.
  </p>
</section>

Using class

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

Multiple classnames are separated by a space.

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

<section class="classnames">

Values

#

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

More Examples

A class attribute styling a <section> element.
Clicking the button toggles a classname that adds a rounded border to the section.

The Night Watch

The Night Watch (Dutch: De Nachtwacht), is a 1642 painting by Rembrandt van Rijn. It is in the collection of the Amsterdam Museum but is prominently displayed in the Rijksmuseum (State Museum) as the best-known painting in its collection. The Night Watch is the most famous Dutch Golden Age painting.


<style>
  .section-bg {
    background: moccasin;
    padding: 20px;
    width: 400px;
    line-height: 1.7em;
  }
  .section-border { border-radius: 50px; }
</style>

<section id="mysection" class="section-bg">
  <h2>The Night Watch</h2>
  <p>The Night Watch (Dutch: De Nachtwacht), is a 1642 
     painting by Rembrandt van Rijn. It is in the collection 
     of the Amsterdam Museum but is prominently displayed 
     in the Rijksmuseum (State Museum) as the best-known 
     painting in its collection. The Night Watch is 
     the most famous Dutch Golden Age painting.
  </p>
</section>

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

<script>
  let toggle = () => {
     let element = document.getElementById("mysection");
     element.classList.toggle("section-border");
  }
</script>

Code explanation

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

The class attribute in <section> assigns one classname.

Repeatedly clicking the button toggles another class, toggling the rounded border of the section.


Browser support

Here is when class support started for each browser:

Chrome
6.0 Sep 2010
Firefox
4.0 Mar 2011
IE/Edge
9.0 Mar 2011
Opera
11.1 Mar 2011
Safari
5.0 Jun 2010

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