What is meta??

META http-equiv Daquan
HTTP-EQUIV is similar to the HTTP header protocol, which responds to the browser with some useful information to help correct and accurately display the content of the Web page. Common types of HTTP-EQUIV are:
1, Content-type and content-language (setting of the display character set)

Description: Sets the character set used by the page to indicate that the text used by the home page is already spoken, and the browser will invoke the corresponding character set to display the page content.

Usage: <meta http-equiv= "Content-type" content= "text/html; Charset=gb2312″>

<meta http-equiv= "Content-language" content= "ZH-CN" >

Note: The META tag defines the character set used by the HTML page as GB2132, which is the GB character code. If you replace "charset=gb2312" with "BIG5", the character set used for this page is the traditional Chinese Big5 code. When you browse some foreign sites, ie browser will prompt you to correctly display the page need to download XX language support. This is done by reading the Content-type property of the META tag of the HTML page and knowing which character set to use to display the page. If the corresponding character set is not installed in the system, ie prompts to download. Other languages also correspond to different charset, such as the Japanese character set is "ISO-2022-JP", the Korean is "ks_c_5601".

Content-type content can also be: Text/xml and other document types;

CharSet options: Iso-8859-1 (English), BIG5, UTF-8, Shift-jis, Euc, Koi8-2, Us-ascii, X-mac-roman, Iso-8859-2, X-mac-ce, ISO-2022-JP, X-sjis, X-euc-jp,euc-kr, Iso-2022-kr, gb2312, gb_2312-80, X-EUC-TW, X-cns11643-1,x-cns11643-2 and other character sets The Content of Content-language can also be: EN, FR and other language code.

2, Refresh (refreshed)

Description: How long (in seconds) to refresh your Web page, or how long it takes to automatically link pages to other pages.

Usage: <meta http-equiv= "Refresh" content= "30″>

<meta http-equiv= "Refresh" content= "5; Url=http://www.downme.com ">

Note: 5 of these are meant to be automatically refreshed to URL URLs after 5 seconds of stay.

3. Expires (term)

Description: Specifies the expiration time of the page in the cache and must be re-accessed on the server once the page expires.

Usage: <meta http-equiv= "Expires" content= "0″>

<meta http-equiv= "Expires" Content= "Wed, 1997 08:21:57 GMT" >

Note: You must use the time format of GMT, or set directly to 0 (the number indicates how much time expires after).

4, Pragma (Cach mode)

Description: Prevents the browser from accessing the contents of the page from the local machine's cache.

Usage: <meta http-equiv= "Pragma" content= "No-cach" >

Note: pages are not guaranteed to be present in the cache, and each visit refreshes the page. With this setting, visitors will not be able to browse offline.

5. Set-cookie (Cookie setting)

Description: When a browser accesses a page, it is cached and can be read from the cache the next time it is accessed to improve speed. Disable caching when you want visitors to refresh your ad's icon every time, or refresh your counter every time. Usually HTML files do not need to disable caching, for the ASP and other pages, you can use the disable cache, because every time you see the page is dynamically generated on the server, the cache loses meaning. If the page expires, the saved cookie will be deleted.

Usage: <meta http-equiv= "Set-cookie" content= "COOKIEVALUE=XXX; Expires=wednesday,

21-oct-98 16:14:21 GMT; path=/">

6, Window-target (display window settings)

Description: Forces the page to appear on a separate page in the current window.

Usage: <meta http-equiv= "Widow-target" content= "_top" >

Note: This property is used to prevent others from calling your page in the frame. Content options: _blank, _top, _self, _parent.

7, Pics-label (page RSAC rating)

Description: There is a content setting in Internet Options for IE that prevents you from browsing some restricted sites, and the limits of websites

is set by this parameter.

Usage: <meta http-equiv= "Pics-label" contect=

"(Pics-1.1′http://www.rsac.org/ratingsv01.html '

I Gen comment ' RSACi North America Sever ' by ' [email protected] '

For ' http://www.microsoft.com ' on ' 1997.06.30t14:21-0500′r (n0 s0 v0 l0) ">

Note: Do not set the level too high. The RSAC evaluation system provides a standard for evaluating Web site content. Users can set up Microsoft Internet Explorer (IE3.0 or more) to exclude sites that contain pornographic and violent content. The HTML in the example above is taken from Microsoft's homepage. The code (n 0 S 0 v 0 L 0) indicates that the site does not contain unhealthy content. Ratings are assessed by RSAC, the rating agency of the American Entertainment Commission, if you want to learn more about the level of RSAC evaluation system, or if you need to evaluate your own website, you can visit the RSAC site: http://www.rsac.org/.

8, Page-enter, Page-exit (Entry and exit)

Description: This is a number of special effects when the page is loaded and paged out.

Usage: <meta http-equiv= "Page-enter" content= "Blendtrans (duration=0.5)" >

<meta http-equiv= "Page-exit" content= "Blendtrans (duration=0.5)" >

Note: Blendtrans is a kind of dynamic filter that produces a fade effect. Another dynamic filter Revealtrans can also be used for page entry and exit effects:

<meta http-equiv= "Page-enter" content= "Revealtrans (duration=x, transition=y)" >

<meta http-equiv= "Page-exit" content= "Revealtrans (duration=x, transition=y)" >

Duration indicates the duration of the filter effect (in seconds)

Transition filter type. Indicates which effect to use, with a value of 0-23.

0 Rectangle Reduced 1 Rectangle enlarged 2 round reduced 3 round enlarged 4 down to top refresh 5 up to bottom refresh 6 left to right refresh 7 right to left flush 8 vertical shutter 9 horizontal shutter 10 dislocation transverse shutter 11 dislocation vertical shutter 12 point spread 13 around to middle refresh 14 middle to left or right refresh 15 middle to upper and lower 16 up to middle 17 right down to top left 18 right top to left lower 19 left upper to right lower 20 left down to top 21 bar 22 vertical bar 23 above 22 random selection of one

9. msthemecompatible (XP theme)

Description: Whether to turn off XP themes in IE

Usage: <meta http-equiv= "msthemecompatible" content= "yes" >

Note: Turn off XP's Blue stereo button system display style, which is much like Win2K.

10. IE6 (Page builder)

Description: Page Builder generator, is IE6

Usage: <meta http-equiv= "ie6″content=" Generator ">

Note: With what things to do, similar products factory manufacturers.

11. Content-script-type (script related)

Description: This is the latest specification of the Web, indicating the type of script in the page.

Usage: <meta http-equiv= "Content-script-type" content= "Text/javascript" >

What is meta??