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This may or may not be a bug but more of a feature. When validating a statement such as: margin: 0 2%; The current (2003-03-06 21:06 UTC) W3.org web-based CSSValidator advises a warning: "You have some absolute and relative lengths in margin. This is not a robust style sheet." However, I feel that '0' is not an absolute measurement in the same way as 0px or 0pt, but more a case of 'null'. If I had a statement such as: margin: 1px 2% then I'd agree with the reported warning. Writing the statement as margin: 0% 2% to please the validator would seem to be inviting a browser bug somewhere or other. Best,