HTML <meta> http-equiv Attribute

HTML <meta> http-equiv Attribute

Example

Use the http-equiv attribute to define the character set for an HTML document:

<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
</head>


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The http-equiv attribute is supported in all major browsers.


Definition and Usage

The http-equiv attribute provides an HTTP header for the information/value of the content attribute.

The http-equiv attribute can be used to simulate an HTTP response header.

If the name attribute is set, the http-equiv attribute should not be set.


Syntax

<meta http-equiv="value" />

Attribute Values

Some commonly used HTTP-header values are:

ValueDescription
cache-control Controls the caching mechanism to use for the document.

Available values:

  • public - cached in public shared caches
  • private - cached in private cache
  • no-cache - not cached
  • no-store - cached but not archived

Example:

<meta http-equiv="cache-control" content="no-cache" />

content-language Specifies the natural language(s) of the document (used by search engines to categorize pages by language).

Example:

<meta http-equiv="content-language" content="en-US" />

content-type Specifies the character set for the contents of the document.

Tip: It is recommended to always specify the character set.

Example:

<meta http-equiv="content-type" content="text/html; charset=UTF-8" />

date Specifies the date and time when the page was created.

Example:

<meta http-equiv="date" content="Wed, 16 Feb 2011 22:34:13 GMT" />

expires Specifies the date and time when the page will expire.

Example:

<meta http-equiv="expires" content="Fri, 30 Dec 2011 12:00:00 GMT" />

last-modified Specifies the last modification date.

Example:

<meta http-equiv="last-modified" content="Mon, 03 Jan 2011 17:45:57 GMT" />

location Redirects the visitor to another location.

Example:

<meta http-equiv="location" content="URL=http://www.w3schools.com" />

refresh Defines a time interval for the document to refresh itself.

Example:

<meta http-equiv="refresh" content="300" />

Note: The value "refresh" should be used carefully, as it takes the control of a page away from the user. Using "refresh" will cause a failure in W3C's Web Content Accessibility Guidelines.

set-cookie Creates a cookie with specified name,expires date and value.

Example:

<meta http-equiv="set-cookie" content="w3scookie=myContent;expires=Fri, 30 Dec 2011 12:00:00 GMT; path=http://www.w3schools.com">

window-target Specifies the name of the frame where the current document must be loaded

 


 

from:http://www.w3schools.com/tags/att_meta_http_equiv.asp

posted @ 2012-04-24 10:38  庚武  Views(558)  Comments(0Edit  收藏  举报