Combining the meta description and Open Graph Protocol description into one tag

Question

Is it possible to combine the meta description and Open Graph Protocol description…

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Answer 1

Some additional info on why this is possible/allowed:

HTML+RDFa 1.1 extends HTML5’s meta element.

HTML+RDFa 1.1 (W3C Recommendation) defines:

If the RDFa @property attribute is present on the meta element, neither the @name, @http-equiv, nor @charset attributes are required and the @content attribute MUST be specified.

So when using RDFa's @property the name is not required but it is not forbidden either, making

perfectly ok according to spec.

I found this from the answer to this related question: Is it possible to use the same meta tag for opengraph and schema.org