Examples

Usingclassin HTML documentsAttributes:

   
  
Header 1
 
A paragraph.
 
Note that this is an important paragraph.
  

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 throughJavaScript.

Tips andNotes

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:. This allows you to combine several CSS classes into one HTML element.

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.

Syntax

Attribute value

Example

连接div标签与dreamdu1样式
 
使用空格分开多个样式连接div标签

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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