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HTML class Attribute


Example

Use of the class attribute in an HTML document:

<html>
<head>
<style>
h1.intro {
    color: blue;
}

p.important {
    color: green;
}
</style>
</head>
<body>

<h1 class="intro">Header 1</h1>
<p>A paragraph.</p>
<p class="important">Note that this is an important paragraph. :)</p>

</body>
</html>

Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The class attribute specifies one or more classnames for an element.

The class attribute is mostly used to point to a class in a style sheet. However, it can also be used by a JavaScript (via the HTML DOM) to make changes to HTML elements with a specified class.


Browser Support

Attribute
class Yes Yes Yes Yes Yes


Differences Between HTML 4.01 and HTML5

In HTML5, the class attribute can be used on any HTML element (it will validate on any HTML element. However, it is not necessarily useful).

In HTML 4.01, the class attribute cannot be used with: <base>, <head>, <html>, <meta>, <param>, <script>, <style>, and <title>.


Syntax

<element class="classname">

Attribute Values

Value Description
classname Specifies one or more class names for an element. To specify multiple classes, separate the class names with a space, e.g. <span class="left important">. This allows you to combine several CSS classes for one HTML element.

Naming rules:

  • Must begin with a letter A-Z or a-z
  • Can be followed by: letters (A-Za-z), digits (0-9), hyphens ("-"), and underscores ("_")
  • In HTML, all values are case-insensitive


Examples

More Examples


Example

Add multiple classes to one HTML element:

<!DOCTYPE html>
<html>
<head>
<style>
h1.intro {
    color: blue;
    text-align: center;
}

.important {
    background-color: yellow;
}
</style>
</head>
<body>

<h1 class="intro important">Header 1</h1>
<p>A paragraph.</p>

</body>
</html>

Try it yourself »


Related Pages

HTML Tutorial: HTML Attributes

CSS Tutorial: CSS Selectors

CSS Reference: CSS .class Selector

HTML DOM Reference: HTML DOM getElementsByClassName() Method

HTML DOM Reference: HTML DOM className Property

HTML DOM Reference: HTML DOM Style Object



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