The WordPress 3.5 release can give you this error: Bad value category tag for attribute rel...
The error is given by W3C Validator.
The error can be fixed with these changes: editing file wp-includes/category-template.php
Goto line 163 in your category template (wp-includes/category-template.php) file and change this line of source code.

and remove the category include whitespace, so that the line looks like this now:

Save the file and check again with W3C Validator.

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