HTML Guide for double quotes

Bad value “”og:type”” for attribute “property” on element “meta”: The string “”og:type”” is not an absolute URL.

og:type
property
meta
double quotes

A <meta> element has an invalid value for the property attribute, probably caused by invalid double quotes. Check out the double quotes, ” should be ".

The correct markup for this meta tag should be like:

<meta property="og:type" content="website" />