What is Canonical Link, Google Friendly URL.
This is used by Google, Bing and other search engines help them enter the page you want to double and close to duplicating pages to help arrange these on your site or on other web pages.
In the above video, Matt Cutts of Google's stock tips on the new tag rel = "canonical" (more precisely - the Canonical link) that search engines now support also top 3.
Google, Yahoo, and Microsoft have agreed to work together on one
"Joint efforts to reduce duplicate content for larger sites and become more complex and the result is the new Canon label."
Google Webmaster example of Canonical tag head office blog:
<Link rel = "canonical" Href = "http://www.example.com/product.php?item=swedish-fish" />
The process is simple. You can put in the main area of the content URL in double this link tag if you need it.
I add an element of the self-referential canonical link as standard these days - any site.
Is rel= "canonical" a hint or a directive?
It's a hint that we honor strongly. We'll take your preference into account, in conjunction with other signals, when calculating the most relevant page to display in search results.
Can I use a relative path to specify the canonical, such as <link rel = "canonical" href = "product.php? Item = Swedish-fish" />?
Yes, relative paths are recognized as expected with the <link> tag. Also, if you include a <base> link in your document, relative paths will resolve according to the base URL.
Is it okay if the canonical is not an exact duplicate of the content?
We allow slight differences, e.g., in the sort order of a table of products. We also recognize that we may crawl the canonical and the duplicate pages at different points in time, so we may occasionally see different versions of your content. All of that is okay with us.
What if the rel = "canonical" returns a 404?
We'll continue to index your content and use a heuristic to find a canonical, but we recommend that you specify existent URLs as canonicals.
What if the rel = "canonical" has not yet been indexed?
Like all public content on the web, we strive to discover and crawl a designated canonical URL quickly. As soon as we index it, we'll immediately reconsider the rel = "canonical" hint.
Can rel = "canonical" is a redirect?
Yes, you can specify a URL that redirects to a canonical URL. Google will then process the redirect as usual and try to index it.
What if I have contradictory rel = "canonical" designations?
Our algorithm is lenient: We can follow canonical chains, but we strongly recommend that you update links to point to a single canonical page to ensure optimal canonicalization results.
Can this link tag be used to suggest a canonical URL on a completely different domain?
** Update on 12/17/2009: The answer is yes! We now support a cross-domain rel = "canonical" link element. **
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