Summary of meta usage in HTML documents

Meta is used to simulate the response header message of the HTTP protocol in HTML documents. It is used in the and of the web page. It has two attributes. :name and http-equiv. The name attribute is mainly used to describe web pages, corresponding to content (web page content), so that search engine robots can find and classify them (at present, almost all search engines use online robots to automatically find meta values ​​to classify web pages). The most important of these are description (description of the site on search engines) and keywords (categorization keywords), so a meta value should be added to each page. The more commonly used ones are the following:

　name attribute

　Used to describe the generation tool (such as Microsoft FrontPage 4.0), etc.;

　Indicate the keywords of your webpage to search engines;

　Tell search engines the main content of your site;

　Tell search engines the author of your site;

　The attribute description is as follows:

Set to all: the file will be retrieved, and the links on the page can be queried;

Set to none: the file will not be retrieved, and the links on the page cannot be queried;

Set to index: The file will be retrieved;

Set to follow: the links on the page can be queried;

Set to noindex: the file will not be retrieved, but the links on the page can be queried;

Set to nofollow: the file will not be retrieved, but the links on the page can be queried.

　http-equiv attribute

　

　and

　 is used to describe the text and language used to create the homepage; another example is English ISO-8859-1 character set, as well as BIG5, utf-8, shift-Jis, Euc, Koi8-2 and other character sets;

　Timing allows the web page to jump to the page http;//yourlink;

　 can be used to set the expiration time of the web page. Once it expires, it must be recalled on the server. It should be noted that the GMT time format must be used;

is used to set the browser to prevent the browser from accessing the page content from the cache of the local machine. After setting, once you leave the web page, you cannot retrieve it from the cache. Call out;

　cookie setting, if the web page expires, the saved cookie will Deleted. It should be noted that the GMT time format must be used; Settings can prevent browsing some restricted websites, and the restriction level of the website is set through the meta attribute;

　 mandatory The page is displayed as an independent page in the current window, which can prevent your own web page from being called as a frame page by others;

　 andSet special effects when entering and leaving the page, this function That is the "format/webpage transition" in FrontPage, but the added page cannot be a frame page.

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