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If checking HTML5 with <area> tag without href attribute, the validator complains "XHTML element area is missing required attribute href". However, http://www.whatwg.org/specs/web-apps/current-work/#attr-hyperlink-href states that the attribute is optional.
Please provide a URL to a reproducer document. Did you try with validator.nu? See HTML5 related bug reporting instructions at end of http://validator.w3.org/feedback.html#bugreport
Sorry for the inconvenience. I filed a bug report at http://bugzilla.validator.nu/show_bug.cgi?id=864 and included a link to a test page there.
see comment #2