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Continue to ChatQuery : Why does Open Graph use As far as I can tell, property is not a valid attribute of the <meta> tag in any of HTML 3, 4, XHTML-Transitional or XHTML-Strict. So why does the Open Graph https://vmapp.org/query/70872/Why-Does-Open-Graph-Use-As-Far-As-I-Can-Tell-Property-Is-Not-A-Valid-Attribute-Of-The-Meta-Tag-In-Any-Of-HTML-3-4-XHTML-Transitional-Or-XHTML-Strict-So-Why-Does-The-Open-Graph/