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From Tantek Celik: When the MarkUp Validator is asked to retrieve a document with a text/css MIME Content-Type, it should silently redirect the request to http://jigsaw.w3.org/css-validator/validator?uri=<URI> instead of complaining about an unknown MIME type.
This looks like it's easy to do with minimal side-effects so I'm targetting 0.6.1. Will have to think about the UI aspects of this though...
Added redirect to Jigsaw for text/css. Closing bug, but may reopen based on feedback if the UI aspects turn out to be too confusing.