www.i18nguy.com/markup/metatags.html
Useful HTML Meta Tags These are the HTML Meta Tags that I find useful or interesting. I am not intending to document all possible Meta Tags here. Check the references for more detail and other Meta Tags.
Robots Note the keywords "HTTP-EQUIV", "Name" and "Content" are case-insensitive. Tag Name Example Description Author <META NAME="AUTHOR" CONTENT="Tex Texin"> The author's name. cache-control <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE"> HTTP 11 Allowed values = PUBLIC | PRIVATE | NO-CACHE | NO-STORE. Public - may be cached in public shared caches Private - may only be cached in private cache no-Cache - may not be cached no-Store - may be cached but not archived The directive CACHE-CONTROL:NO-CACHE indicates cached information should not be used and instead requests should be forwarded to the origin server.
Note: It may be better to specify cache commands in HTTP than in META statements, where they can influence more than the browser, but proxies and other intermediaries that may cache information. Content-Language <META HTTP-EQUIV="CONTENT-LANGUAGE" CONTENT="en-US,fr"> Declares the primary natural language of the document. May be used by search engines to categorize by language. CONTENT-TYPE <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=UTF-8"> The HTTP content type may be extended to give the character set. It is recommended to always use this tag and to specify the charset. "> The text can be used when printing a summary of the document. Particularly important if your document has very little text, is a frameset, or has extensive scripts at the top. EXPIRES <META HTTP-EQUIV="EXPIRES" CONTENT="Mon, 22 Jul 2002 11:12:01 GMT"> The date and time after which the document should be considered expired. An illegal EXPIRES date, eg "0", is interpreted as "now". Setting EXPIRES to 0 may thus be used to force a modification check at each visit. Web robots may delete expired documents from a search engine, or schedule a revisit.
HTTP 11 (RFC 2068) specifies that all HTTP date/time stamps MUST be generated in Greenwich Mean Time (GMT) and in RFC 1123 format. RFC 1123 format = wkday "," SP date SP time SP "GMT" wkday = (Mon, Tue, Wed, Thu, Fri, Sat, Sun) date = 2DIGIT SP month SP 4DIGIT ; day month year (eg, 02 Jun 1982) time = 2DIGIT ":" 2DIGIT ":" 2DIGIT ; Typically used for synonyms and alternates of title words. PRAGMA NO-CACHE <META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE"> This directive indicates cached information should not be used and instead requests should be forwarded to the origin server.
html"> Specifies a delay in seconds before the browser automatically reloads the document. Optionally, specifies an alternative URL to load, making this command useful for redirecting browsers to other pages. ROBOTS <META NAME="ROBOTS" CONTENT="ALL"> <META NAME="ROBOTS" CONTENT="INDEX,NOFOLLOW"> <META NAME="ROBOTS" CONTENT="NOINDEX,FOLLOW"> <META NAME="ROBOTS" CONTENT="NONE"> CONTENT="ALL | NONE | NOINDEX | INDEX| NOFOLLOW | FOLLOW | NOARCHIVE" default = empty = "ALL" "NONE" = "NOINDEX, NOFOLLOW" The CONTENT field is a comma separated list: INDEX: search engine robots should include this page. FOLLOW: robots should follow links from this page to other pages. NOINDEX: links can be explored, although the page is not indexed. NOFOLLOW: the page can be indexed, but no links are explored. NOARCHIVE: Google uses this to prevent archiving of the page.
ROBOTS META Command above, Google supports a GOOGLEBOT command. With it, you can tell Google that you do not want the page archived, but allow other search engines to do so. If you specify this command, Google will not save the page and the page will be unavailable via its cache.
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