Duplicate content is something that has been an issue for quite sometime in terms of search engine optimisation and now Google, Yahoo! and MSN have introduced a new way for webmasters to deal with this issue in the form of the “Canonical Tag”.

In simple terms it allows webmasters to specify the preferred version of a URL. Using the Canonical Tag, webmasters can now sleep safely in the knowledge that Google knows that there is a preferred URL and that it should not penalise the site for having duplicate content to due an obscure URL structure created for programmatic purposes.

How do you use this tag?

Well simply add something like this within the head area of your HTML:

<link rel=”canonical” href=”http://www.example.com/page.php?idname=web-design”/>

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