OpenGraph tags and HTML5 validity

Posted by netmano on Pro Webmasters See other posts from Pro Webmasters or by netmano
Published on 2012-03-01T11:14:53Z Indexed on 2012/04/16 11:45 UTC
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facebook

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html5

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validation

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facebook-graph

I have a HTML5 based page, and I inculded the OpenGraph tags according to it's documentation. Also I checked with Facebook Debug, and it can parse the metadata. But when I use W3C Validator, it reports the OG tags as error:

Attribute content not allowed on element meta at this point. <meta property="fb:admins" content="...." />

Attribute content not allowed on element meta at this point. <meta property="og:url" content="http://www....">

They are all in the <head>. I would need my page be "valid" HTML5 and OG tags, as well. Could you help me giving a hint how can it be achieved?

UPDATE: The name version also invalid: <meta name='fb:admins' content=''>

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