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http://validator.w3.org validator returns "Bad value home for attribute rel on element a: Keyword home is not registered." for correct rel-home microformats standard syntax, http://microformats.org/wiki/rel-home . For example validator.w3.org fails on: <a href="http://website.com" rel="home">Home</a>
This is just due to the W3C HTML5 backend not being up to date with the latest changes made to the validator.nu sources upstream. But I will update the W3C HTML5 backend within the next couple of weeks. If you don't hear back from me here by November 4 or so, please post another comment to remind me.
O.K., Michael! I saw that it's fixed in validator.nu
see comment #2
It seems been fixed and `rel=home` is valid now.