Opengraph W3C valid?

Question

I would like to know if the opengraph markup is W3C valid, I\'m getting the following error when I try to validate it:

Line 14, Column 17: there is no attribute          


        

Answer 1

It's not valid in the normal HTML doctypes, but there is a doctype you can use to validate XHTML documents including Open Graph:

See this question: Html validation error for property attribute