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Validator gives error message for XHTML strict, "document type does not allow element "col" here; assuming missing "colgroup" start-tag" Code is displayed below. <col> is permissable outside <colgroup> element so looks like a bug. <colgroup span="2" width="100"> <col align="left" /> <col align="right" /> </colgroup> <col align="center" width="auto" />
It is very improbable that there would be a bug here, since this part of validation comes from the machine-readable and authoritative definition of XHTML Strict. A URL, or alternatively more markup context (are you in a <table>?), would help understand the issue.
Without any clarification in 3 months, closing this bug.