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:
|
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 classList Property
HTML DOM Reference: HTML DOM Style Object