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The validator currently throws an error for: p { column-width:25em } or p { column-width:25px } the following pass validation p { column-width:25 em } p { column-width:25 px } p { column-width: 25 px } Is this an error in parsing the value for this particular property? (both prod and dev versions show this bug)
credit where due. This issue was first reported by Rafael Holt: http://lists.w3.org/Archives/Public/www-validator-css/2008Feb/0032.html
the class was checking for numbers instead of length (with the specia case of 0 being a number and a valid length). fixed version online at http://qa-dev.w3.org:8001/css-validator/