False positive: Bad value msapplication-TileImage for attribute name on element meta: Keyword msapplication-tileimage is not registered.

Hello,

Validator incorrectly gives these errors:

Bad value msapplication-TileImage for attribute name on element meta:
Keyword msapplication-tileimage is not registered.
Bad value msapplication-TileColor for attribute name on element meta:
Keyword msapplication-tilecolor is not registered.
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Despite that the names are listed in WHATWG Wiki:

http://wiki.whatwg.org/wiki/MetaExtensions

I bumped that error while checking http://eksisozluk.com

Thanks,

Sedat