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.