Http-equiv in the META tag

Http-equiv, as the name implies, is equivalent to the HTTP file header function, it can send back some useful information to the browser to help correct and accurate display of the content of the Web page, and the corresponding property value of content,content content is actually the variable value of each parameter.

The Http-equiv property syntax format for referencing the meat tag is: <meta http-equiv= "parameter" content= "parameter variable value", where the Http-equiv attribute mainly has the following parameters:

1. Expires (term)
Description: Can be used to set the expiration time of a Web page. Once the page expires, it must be retransmitted to the server.
Usage:

Note: The time format of GMT must be used.

2. Pragma (cache mode)
Note: is used to set the browser from the local computer cache to access the content of the page, once left the page can not be recalled from the cache
Usage:

Note: This setting makes it impossible for visitors to browse offline.

3, Refresh (refreshed)
Description: Automatically refreshes and points to the new page.
Usage:

Note: 2 of these are meant to be automatically refreshed to URL URLs after 2 seconds of stay.
4. Set-cookie (Cookie setting)
Note: If the page expires, the cookie will be deleted.
Usage:

Note: The time format of GMT must be used.

5, Window-target (display window settings)
Description: Forces the page to appear on a separate page in the current window.
Usage:

< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >
Note: Used to prevent others from calling their own pages in the frame. &NBSP;

6, Content-type (setting of the display character set) &NBSP;
Description: Sets the character set used by the page. &NBSP;
Usage:

< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >

7, Pics-label (page level rating) &NBSP;
Usage:

<meta http-equiv= "Pics-label" contect= ""; 
 

Description: There is a content setting in Internet options in IE that prevents you from browsing some restricted websites , and the site's limit level is set by the meta attribute. &NBSP;

8, Page_enter, Page_exit &NBSP;
Set special effects when entering the page

<meta http-equiv= "Page-enter" contect= "Revealtrans (duration=1.0,transtion= 12)" &  Gt 

< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >< Span class= "Apple-converted-space" >
Set special effects when leaving the page

<meta http-equiv= "Page-exit"    contect= "Revealtrans (duration=1.0,transtion=    )" >  

The value of duration is the time, in seconds, that the page dynamically transitions.
Transition is the transition mode, which has a value of 0 to 23, corresponding to 24 transition modes respectively. As the following table:
0 box-shaped contraction 1 box-shaped radiation
2 round contraction 3 round emission
4 from bottom to top 5 up down
6 from left to right 7 right to left
8 Vertical Blinds 9 Horizontal Blinds
10 Horizontal Lattice Blinds 11 Vertical lattice Blinds
12 free dissolve 13 from the left and right sides to the middle expansion
14 expand from middle to left, 15 from upper and lower ends to center
16 Expand from middle to bottom 17 from the upper right corner to the bottom left
18 from the lower-right corner, expand 19 from the upper-left corner to the lower -right corner
20 Expand 21 horizontal lines from the lower-left corner to the upper-right corner
22 Vertical Linear Expansion 23 randomly produces a transition pattern

9, clear the cache (re-visit this site to re-download!) )

<meta http-equiv= "Cache-control" content= "No-cache"; 
 

10, set the expiry time of the Web page &NBSP;

<meta http-equiv= "expires" content= "0"; 
 

11, keywords, for the search engine use &NBSP;

<meta http-equiv= "keywords" content= "keyword1,keyword2,keyword3"; 
 

12. Page Description &NBSP;

<meta http-equiv= "description" content= "This is my page" >

Http-equiv in the META tag