CSS expressions are IE proprietary and do not work (are ignored by) other browsers. They will never validate. You may put them in a separate stylesheet and use IE conditional comments to make that stylesheet (if on the page) or stylesheet link (if an external stylesheet) look like a comment to all but IE. They still won't be valid, but the validator will also think they are comments, so won't bother you about them, ex:
HTML Code:
<!--[if IE]>
<link rel="stylesheet" href="ieOnly.css" type="text/css">
<![endif]-->
See also:
http://msdn.microsoft.com/en-us/libr...12(VS.85).aspx
for more on how these comments work.
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