Valid CSS in IE! This symbol applies when all the CSS is valid for w3c except possibly some isolated parts which might only be valid in IE.
I am not using this designation lightly. The documents where I have affixed this logo all use w3c valid HTML and the style sheet has been separated into 2 parts: one which is fully valid in the w3c validator and one which is only valid for IE. Some inline styles used in the HTML of the documents may be valid only in IE as well, but no HTML errors should be detected by the w3c HTML validator. No other errors should be present. For example this will apply to colored scrollbars that may be used in the body style and IE-specific filters used in inline styles.

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Valid CSS! Valid XHTML 1.0 Transitional