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Unicorn combines a number of popular tools in a single, easy interface, including the Markup validator, CSS validator, mobileOk checker, and Feed validator, which remain available as individual services as well.
[edited by: tedster at 7:07 pm (utc) on Jul 27, 2010]
[edit reason] added quote [/edit]
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /unicorn/.
Reason: Error reading from remote server
Apache/2 Server at validator.w3.org Port 80