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"In the past, everyone knew that Google and the other engines, stayed away from your CSS files.  However, after on October 19th, Matt Cutts posted a blog entry named SEO Mistakes: Unwise comments which showed an example of someone using CSS.  Matt wrote;I don\u2019t recommend that people use CSS to hide text, and I don\u2019t recommend that they document it, either.Then Jagger update hit us, and many now believe that Google does peak at your CSS files.  A DigitalPoint Forum thread asks Does google read external CSS files yet?  Some reply \"no\" right off the bat, but I wouldn't be so quick to say no.  Many respectable SEOs have been chattering about Google reading your CSS just for this.  So just be careful, especially now."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/002788.html>