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You have no background-color set (or background-color is set to transparent) but you have set a color. Make sure that cascading of colors keeps the text reasonably legible. ^ Unnecessary warnings as this occurs for every element with no background color set. Update to recognise background colors for parent elements?
As the text says "Make sure that cascading of colors keeps the text reasonably legible", and it is just warnings (you can adjust the level of warnings through the validator interface). I mark this bug as resolved.