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rel=canonical: trying to get Google to understand

rel=canonical: trying to get Google to understand

I wrote a few days ago about how duplicate content can damage your site's visibility in search results. This first fix comes in the form of a simple line in your page header.

Back in February, Google announced it had begun supporting the rel=canonical hint in determining the definitive URL for an item of content. This sounds like a one-stop solution to all our duplicate content problems.

For example, my previous post can be reached by the full URL, but also (because of the Wordpress system defaults) via

http://seowebmonkey.com/?p=113

If someone decides to link to my post using that URL,  it might therefore also enter the search index in addition to the full version - thus duplicate content.

Placing a rel=canonical instruction in your page’s header can resolve this problem before it occurs. It tells the search engine which URL to use as the definitive (canonical) URL for that page of content, regardless of what was used to get there.

Here’s an example for the above page:

<link rel="canonical" href="http://seowebmonkey.com/duplicate-content-web-applications/"/>

This sits within the <head> section of your page’s html.

This link-tag is supported by Google, Yahoo, Ask.com and Microsoft Live Search.

Does it work?

Google describes its support of rel=canonical as a “hint”. This means it will use the information to determine a canonical URL, but reserves the right to do what it wants when it feels like it. This seems to be a way to cover for errors that slip through the net. Search engines are rarely predictable, and no single method should be trusted in avoiding duplicate content.

For all content management systems in particular, this is an essential addition to the page output. How rapidly Google will change any existing duplicative content URLs that are already in its index is yet to be clearly determined, and this alone will not enable webmasters to explicitly request removal of duplicative URLs via the Google Webmaster Tools interface.

Direct removal of pages from Google’s search index will be covered in my next post.

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Imagine a summer coffee shop working session, just to kill the monotony of the home office, while across the room a small bubble of intensity was building.

The [prospective] client, late twenties, retaining his outdoor coat despite the humidity and non-functioning aircon, was sat without coffee - on the comfy leather sofa, of course. Web designer/developer turns up amongst apologies for his tardiness and carrying a tray containing coffee for himself and the client (and the web guy’s child who plays no part in this account).

This site attempts to break down personal, practical experience of web development and SEO into easily accessible, digestible articles and information.

Neil Dixon has been involved in web development and SEO since the late 1990s and is currently responsible for SEO for an online media entertainment network.

Views and opinions contained on this site are those of the article author(s) and do not reflect those of any organisation to which they are affiliated.

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