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A lot of people, including myself, have been confused by the line that appears after successful validation of a Cascading Style Sheet. Currently reads: "To work as intended, your CSS style sheet needs a correct document parse tree. This means you should use valid HTML." The message should read: "No error or warning found. Remember to also validate your html if you have not yet already done so."
My revision would be: Also validate your HTML. (More info...) The text "validate your HTML" would be linked to the home page of the markup validator. The text "More info" would be linked to a page explaining how CSS can only work with element trees, not with tag soup. Brevity is golden.
confusing message removed.