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Canonical link element – Wikipedia From the free encyclopedia Redirected from meta tag Jump to navigation search Type of hyperlink A canonical is an HTML that helps webmasters prevent duplicate content issues in engine optimization by specifying or preferred version a web page It described RFC which went live April Contents Purpose How engines handle rel Implementation Examples HTTP See also References edit major problem for determine original source documents are available on multiple URLs Content duplication can happen many ways including Duplication due GET-parameters with CMS accessibility different hosts protocols print versions websites Duplicate occur when same accessible For example http www com html would be considered entirely parameter even though both may reference In February Google Yahoo and Microsoft announced support inserted into lt head gt section allow these The make clear should credited as Search try utilize definitions output filter their results If contain result set URL will likely incorporated finds identical instances it decides show one them Its choice resource display depend upon query citation needed According not directive but rather hint ranking algorithm honor strongly While has its benefits Matt Cutts then Google’s webspam team said prefers use redirects preference because spiders choose ignore if they deem more beneficial do so either used b style color sent header document non alternate way By standard span class p nt na o s quot href must within Below you see code utilises inside tags could such https php tell webpage DOCTYPE body OK Content-Type application pdf Link Content-Length normalization Kupke Joachim Specify your Retrieved Learn about Element minutes canonicalization right Audisto GmbH Biswas Kushal Issue Use Tag Proper Way RevenueI Archived June Zadro Dario Rel Beginners Guide Tags Where When Them Web Fox Vanessa amp Unite On To Reduce Clutter Engine Land And Other Engines Manage Links seomediax seo how-google-and-other-search-engines-manage-canonical-links Consolidate Console Help google equals corner case w schools en wikipedia org index title oldid Categories optimizationHTMLHidden categories Articles short descriptionShort description matches WikidataAll articles unsourced statementsArticles statements October Pages using magic links Navigation menu Personal tools Not logged inTalkContributionsCreate accountLog Namespaces ArticleTalk Variants Views ReadEditView history More Main pageContentsCurrent eventsRandom articleAbout WikipediaContact usDonate Contribute HelpLearn editCommunity portalRecent changesUpload file Tools What hereRelated fileSpecial pagesPermanent linkPage informationCite this pageWikidata item Print export Download PDFPrintable Languages Catal Deutsch T rk e Edit This was last edited September at UTC Text under Creative Commons Attribution-ShareAlike License additional terms apply site agree Terms Privacy Policy registered trademark Wikimedia Foundation Inc non-profit organization policy About Disclaimers Contact Mobile view Developers Statistics Cookie statement