Possible Duplicate:Is minifying id and class names a bad SEO practice? I have seen some of our competitors using keyword rich CSS class names. As an example, if I were in the pet grooming business, I would name my #menu  as: #menu.pet.grooming.moreKeywords.etc { ... }Does this have any effect on SEO? If so, what is the best practice?
Do CSS class names have any effect on SEO?
css;seo
Google says nothing about that.The more important things are page structure (correct tags, H1 for headers, sections, etc..), metatags and urls. The google prefers sites that loads fast, that have good structure and descriptive urls.You should focus on that.More info here:http://support.google.com/webmasters/bin/answer.py?hl=en&answer=35291