HTML <b> class Attribute

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

Cézanne's early work is often concerned with the figure in the landscape and includes many paintings of groups of large, heavy figures in the landscape, imaginatively painted.

<style>
  .teal {color: teal; font-size: 24px;}
</style>

<article>
  <p>
    Cézanne's <b class="teal">early work</b> is 
    often concerned with the figure in the landscape 
    and includes many paintings of groups of large, 
    heavy figures in the landscape, imaginatively painted. 
  </p>
</article>

Using class

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

Multiple classnames are separated by a space.

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

<b class="classnames">

Values

#

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

More Examples

A class attribute styling a <b> element.
Clicking the button toggles a classname that changes the text color.

Cézanne's early work is often concerned with the figure in the landscape and includes many paintings of groups of large, heavy figures in the landscape, imaginatively painted.


<style>
  .teal-text { color: teal; font-size: 24px; }
  .orangered { color: orangered; }
</style>

<article>
  <p>
    Cézanne's <b id="early" class="teal-text">early work</b> is 
    often concerned with the figure in the landscape and includes 
    many paintings of groups of large, heavy figures in the 
    landscape, imaginatively painted. 
  </p>
</article>

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

<script>
  let toggle = () => {
     let element = document.getElementById("early");
     element.classList.toggle("orangered");
  }
</script>

Code explanation

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

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

Clicking the button toggles the second class, changing the element's text 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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