<http://schema.org/description>
"You know that often, Google Webmaster Tools shows an image preview of your site's home page on the dashboard listing view of your site profiles within Google Webmaster Tools.What if the image of your "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-webmaster-preview-wrong-18213.html>