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Are there any other CSS validation sites out there besides jigsaw?
It’s saying that content: none; is incorrect, but according to the specs it should be fine.
The best online css validator that I have found is http://www.w3schools.com/site/site_validate.asp
There are also good browser plug-ins that you can use to validate your css. I recently wrote a blog post with details and links to both online and browser validators – you can go to my blog and read the post (“Validating Your Web Pages for SEO and Useability – Why You Should Do It and How”) if you want more information.
Let me know if you have questions!