Examples
Using class in HTML documents Attributes:
<html>
<head>
<style type="text/css">
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>Definition and usage
The class attribute specifies elements The class name (classname).
The class attribute is most often used to point to a class in a style sheet. However, it can also be used to change HTML elements with specified classes through JavaScript.
Tips and Notes
Note: The class attribute cannot be used in the following HTML elements: base, head, html, meta, param, script, style and title.
Tip: You can assign multiple classes to HTML elements, for example:
Tip: The class name cannot start with a number! Only Internet Explorer supports this practice.
Browser Support
W3C: The "W3C" column indicates whether the attribute is defined in the W3C's HTML/XHTML recommendations.
| IE | Firefox | Opera | Safari | W3C |
| YES | YES | YES | YES | YES |
Syntax
<element class="value">
Attribute value
| Value | Description |
| classname | Specifies the name of the element's class. To specify multiple classes for an element, separate the class names with spaces. |
Example
<div class="dreamdu1">连接div标签与dreamdu1样式<div> <div class="dreamdu12px dreamdublack dreamdubold">使用空格分开多个样式连接div标签<div>
div.dreamdu12px{
font-size: 12px;}
div.dreamdublack{
color: black;}
div.dreamdubold{
font-weight: bold;}You can use multiple classnames, but they must be separated by spaces
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