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Meta is the response header message used to simulate an HTTP protocol in an HTML document. The META tag is an accessible tag in the head area of the HTML language, which is located between the <HEAD> tag and the <TITLE> tag in the header of the HTML document, which provides information that is not visible to the user. Meta tags are often used to define page themes for search engine robots, or to define a cookie on a user's browser, which can be used to identify the author, format the page, annotate the content feed and keywords, and set the page to refresh itself according to the intervals you define. and set the RASC content level, and so on.
Name Property1, <meta name= "Generator" contect= "" > To illustrate the Build tool (such as Microsoft FrontPage 4.0), etc.;2, <meta name= "KEYWords" contect= "" > to the search engine to explain the keywords of your page;3, <meta name= "DEscription" contect= "" > Tell the Search engine the main content of your site;4, <meta name= "Author" contect= "Your Name" > tell the Search engine the author of your site's production;5, <meta name= "Robots" contect= "All|none|index|noindex|follow|nofollow" >the properties are described as follows:set to all: The file will be retrieved and the link on the page can be queried;set to None: The file will not be retrieved, and the link on the page cannot be queried;set to index: The file will be retrieved;set to follow: links on the page can be queried;set to Noindex: The file will not be retrieved, but the link on the page can be queried;set to Nofollow: The file will not be retrieved and the link on the page can be queried. Http-equiv Property1, <meta http-equiv= "Content-type" contect= "text/html"; charset=gb_2312-80 "> <meta http-equiv= " Content-language "contect=" ZH-CN "> to illustrate the text and language used for home page production , as well as the iso-8859-1 character set in English, BIG5, Utf-8, Shift-jis, Euc, Koi8-2 and other character sets; 2, <meta http-equiv= "Refresh" contect= "N;url=http://yourlink" > Timing let the page in the specified time n, jump to the page http://yourlink;3, <meta http-equiv= "Expires" contect= "mon,12 May 2001 00:20:00 GMT" > can be used to set the expiration time of the Web page and must be recalled to the server once it expires. It is important to note that the GMT time format must be used;4, <meta http-equiv= "Pragma" contect= "No-cache" > is used to set the browser from the local computer cache to access the page content, set once left the page can not be recalled from the cache;5, <meta http-equiv= "Set-cookie" contect= "mon,12 May 2001 00:20:00 GMT" >cookie set, if the page expires, the cookie will be deleted. It is also important to note that GMT time format must be used;6, <meta http-equiv= "Pics-label" "contect=" "> Page rating, Internet Options in IE have a content setting, you can prevent browsing some restricted sites, The limit level of the website is set by the meta attribute;7, <meta http-equiv= "Windows-target" contect= "_top" > Force page in the current window with a separate page display, you can prevent their own web page by others as a frame page call;8, <meta http-equiv= "Page-enter" contect= "Revealtrans (duration=10,transtion=)" > and <meta http-equiv= " Page-exit "contect=" Revealtrans (duration=20,transtion=6) > Set special effects when entering and leaving the page, which is "format/page Transitions" in FrontPage, However, the added page cannot be a frame page. Open Graph ProtocolWhat is the Meta property=og tag?
OG is a new HTTP header tag, the Open Graph Protocol:
The Open Graph Protocol enables any Web page to become a rich object in a social graph.+ n3}
That is, the protocol can make a Web page a "rich media object."
Using meta Property=og tags, you agree that Web content can be referenced by other social web sites, etc., the current agreement by SNS sites such as Fackbook, Renren adoption.
SNS has become a popular application on the Web, high-quality content through sharing among friends quickly spread. In order to improve the efficiency of external content dissemination, Facebook unveiled a set of open-content agreements at the F8 Conference in 2010 (open Graph Protocol), where SNS can extract the most effective information from the page and present it to the user as long as the agreement is adhered to.
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META tags in html and meta Property=og tag meanings
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