The rel=”canonical” link duplicate content panacea

As many readers probably know, Google and other search engines recently announced support for a rel=”canonical” link attribute value. The new attribute value canonical (not a tag mind you, link is the html tag) can be used by website developers to specify which of essentially similar web pages is the definitive version.

A SEO problem known as duplicate content arises when websites use different URLs, generally through parameters, to provide slightly different versions of a page, such as a printer friendly version, or to support web analytics campaign tracking. In order to give search users unique choices, search engines tend to choose the “best” URL for a page, filtering out similar versions.

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I just discovered that someone on a Web Analytics discussion group misconstrued the recent Google announcement of better Flash search engine crawling support to mean it is now good to use Flash when developing web sites.

Nothing could be further from the truth. While Google’s move is welcome support for all the legacy Flash websites still in circulation, companies shouldn’t generally be deploying new sites made wholly using Flash.

What Google has announced is significant improvements to their ability to extract information, specifically text and links, from Flash objects. Despite what many are trying to read into this, Google already crawled and extracted this information from Flash only sites – this is not exactly new.

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At a recent Legal Marketing Italia seminar, the question arose as to why a company’s web site doesn’t rank well, even for the company’s name. In Italy, the most common problem encountered with websites is the use of Macromedia / Adobe Flash to develop most or all of a company’s website. This case was no exception.

Update: Google has announced improved crawling support for Flash sites. Our related article Why Flash is still bad for SEO and the Web explains that nothing has changed – the best websites should still avoid Flash. (2 July 2008)

Italy has a strong history of excellence in visual communication, including graphic design. Indeed, the very successful New York City subway signage was designed by an Italian. Many Italian graphic designers have worked on web sites, adopting Flash as their preferred technology when moving from the printed media to the web. Flash allows “pixel perfect” control over web design, including font specification.

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