In the world of search engine optimization, a perennial argument is whether Google's (Nasdaq: GOOG) ranking factors look for clean code in a Web site. The W3C has developed two popular tools that check Web sites for errors: The W3C validation tool looks at HTML code, while the CSS validation tool checks the CSS Style Sheet. These free tools scan all of a site's code to make sure it is compliant with current Web standards. [*Correction - Nov. 12, 2009]
Not long ago, Matt Cutts, a Google software engineer, said -- not for the first time -- that W3C Validation does not affect search engine rankings.
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