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The HTML Validator states that the page to be validated has and unsupported Content Type (which is text/plain), but the page has no such document type. The document type is as follows: <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> I have also tried converting the page to XHTML 1.0 Transitional, but I still get the same error.
This is a bug in the Internet Explorer included with Windows XP SP2; see comments on Bug #838, of which this is a duplicate report, for more. *** This bug has been marked as a duplicate of 838 ***