HTML <meta> instructions using

Www.w3school.com Description:

HTML <meta> Tag Browser support

IE	Firefox	Chrome	Safari	Opera

All browsers support <meta> tags.

Definition and usage

The <meta> element provides meta-information about the page (meta-information), such as descriptions and keywords for search engines and update frequency.

The <meta> tag is located in the header of the document and does not contain any content. The properties of the <meta> tag define the name/value pairs associated with the document.

The difference between HTML and XHTML

The,<meta> tag does not have an end tag in HTML.

In XHTML, the,<meta> tag must be properly closed.

Tips and Comments:

Note The:<meta> tag is always inside the head element.

Note: Metadata is always passed in pairs in the form of a name/value.

Required Properties

Properties	value	Description
Content	Some_text	Define meta information related to the HTTP-EQUIV or Name property

Optional properties

Properties	value	Description
Http-equiv	Content-type Expires Refresh Set-cookie	Associate the Content property to the HTTP header.
Name	Author Description Keywords Generator Revised Others	Associate the Content property to a name.
Scheme	Some_text	Defines the format used to translate content property values.

Name property

The Name property provides the names in the name/value pairs. Neither HTML nor XHTML tags specify any pre-defined <meta> names. Typically, you are free to use a meaningful name for yourself and the reader of your source document.

"keywords" is a name that is often used. It defines a set of keywords for a document. Some search engines use these keywords to categorize documents when they encounter these keywords.

A meta tag like this might be helpful for entering the index of a search engine:

name="keywords"Content= "Html,asp,php,sql" >

If the Name property is not provided, then the names in the name/value pairs take the value of the Http-equiv property.

Http-equiv Property

The Http-equiv property provides a name for a name/value pair. and instructs the server to include a name/value pair in the header of the MIME document to be routed to the browser before sending the actual document.

When the server sends a document to the browser, many name/value pairs are sent first. Although some servers send many of these name/value pairs, all servers must send at least one: content-type:text/html. This tells the browser to be ready to accept an HTML document.

When using the <meta> tag with the Http-equiv property, the server adds a name/value pair to the header of the content sent to the browser. For example, add:

http-equiv="charset"http-equiv="expires"Content= "from Dec" >

The head that is sent to the browser should contain:

Content-type:text/htmlcharset:iso-8859-1expires:31 DEC 2008

Of course, these fields make sense only if the browser can accept these additional header fields and use them in the appropriate way.

Content Properties

The Content property provides the value in a name/value pair. The value can be any valid string.

The content property is always used with the Name property or the Http-equiv property.

Scheme attribute

The scheme attribute is used to specify the scheme to be used to translate attribute values. This scenario should be defined in the profiles file specified by the profile property of the

The following is a reference to the contents of http://www.cnblogs.com/lovesong/p/5745893.html

Meta-detailed

Meta tags can be divided into two parts: http-equiv and name variables.

Http-equiv

HTTP-EQUIV corresponds to the file header of HTTP, which can send back useful information to the browser to help the browser display the content of the page correctly.

Value	Describe	Example
Content-type	Set the character set used by the page	<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "> GB2312, the representative of the website is the use of the code is Simplified Chinese, iso-8859-1, the representative description of the website is the use of the code is English, UTF-8, representing the world-wide language encoding; PS:HTML5 page is done directly using <meta charset= " Utf-8 "/>
X-ua-compatible	IE8 's special tag, used to specify the IE8 browser to simulate the rendering of a particular version of IE, to resolve some compatibility issues.	<meta http-equiv= "x-ua-compatible" content= "ie=7" > The above code tells IE that the IE8/9 will render the page with the IE7 engine, whether or not the document standard is declared with a DTD. <meta http-equiv= "x-ua-compatible" content= "ie=8" > The above code tells IE Browser, IE8/9 will be IE8 engine to render the page. <meta http-equiv= "x-ua-compatible" content= "Ie=edge" > The above code tells IE Browser, IE8/9 and later version will be the highest version of IE to render the page. <meta http-equiv= "x-ua-compatible" content= "ie=edge,chrome=1" > The above code Ie=edge tells IE to use the latest Engine rendering Web page, chrome=1 can activate Chrome frame.ps: Google add a plugin: Google Chrome frame (Google embedded browser framework GCF), This plugin can keep the user's IE browser intact, but when users are browsing the web, they are actually using the Google Chrome kernel, and support IE6, 7, 8 and many other versions of IE browser.
Expires	Sets the expiration time of the Web page.	<meta http-equiv= "Expires" content= "FRI,12JAN200118:18:18GMT" > PS: The time format of GMT must be used
Refresh	Automatically refreshes and points to the new page.	<meta http-equiv= "Refresh" content= "2; Url=https://www.baidu.com "> Ps:2 on behalf of the page after 2 seconds to jump to the back of the URL
Set-cookie	If the page expires, the local cookie is automatically deleted.	<meta http-equiv= "Set-cookie" content= "Cookie value=xxx;expires=friday,12-jan-200118:18:18gmt;path=/" > PS: The time format of GMT must be used.
Windows-target	Force the page to be displayed as a separate page in the current window, preventing your page from being called by others as a frame page	<meta http-equiv= "Window-target" content= "_top" >
Cache-control	Caching mechanism	<meta http-equiv= "Cache-control" content= "No-cache" > Public: Indicates that the response can be cached by any buffer. Private: Indicates that the entire or partial response message for a single user cannot be shared with the cache. This allows the server to simply describe a partial response message for the user, and this response message is not valid for another user's request. No-cache: Indicates that the request or response message cannot be cached. No-store: Used to prevent important information from being inadvertently released. Sending in the request message will make the request and response messages do not use the cache. Max-age: Indicates that the client can receive a response that has a lifetime of not greater than the specified time (in seconds). Min-fresh: Indicates that the client can receive a response time that is less than the current time plus the specified time. Max-stale: Indicates that the client can receive a response message that exceeds the timeout period. If you specify a value for the Max-stale message, the client can receive a response message that exceeds the specified value for the timeout period.

Name

The name attribute is mainly used to describe the Web page, and its corresponding property value is content,content content is mainly convenient for search engine robot to find information and classification information.

Value	Describe	Example
Author	The author of the callout page	<meta name= "Author" content= "Dashen"/>
Keywords	Page keywords, used by search engine included	<meta name= "keywords" content= "news, news Center, news channel" >
Description	Page description, for search engine inclusion	<meta name= "description" content= "News center, including political news, domestic news, international news, social news, current affairs commentary, news Pictures, news topics, News forum, Military, history, professional Affairs report Portal" >
Viewport	Used to control page scaling	Maximum-scale=1, minimum-scale=1, User-scalable=no "> Details can be viewed at: http://www.cnblogs.com/lovesong/p/4355029.html
Renderer	Specifies how the dual-core browser renders the page by default.	<meta name= "renderer" content= "WebKit" >//default WebKit kernel <meta name= "renderer" content= "Ie-comp" >//default IE Compatibility mode <meta name= "renderer" content= "Ie-stand" >//default IE Standard mode ps:360 Browser Support
Generator	Describe what software is used to make the website	<meta name= "generator" content= "Microsoft"/>
Revised	Modification time of Web document	<meta name= "Revised" content= "design net, 6/24/2015"/>
Robots	Used to tell the search robot which pages need to be indexed, and which pages do not need indexes.	<meta name= "Robots" content= "None"/> Value: All|none|index|noindex|follow|nofollow, default Allall: The file will be retrieved, and the link on the page can be queried; none: The file will not be retrieved and the link on the page cannot be queried; index: The file will be retrieved Follow: The link on the page can be queried; NOINDEX: The file will not be retrieved, but the link on the page can be queried; nofollow: The file will not be retrieved and the link on the page can be queried.
Copyright	Website Copyright Information	<meta name= "Copyright" content= "This page copyright xxx all. All rights Reserved "/>

HTML <meta> instructions using