<http://schema.org/description>
"There are several threads at the Google Webmaster Help forums with Google users saying they are seeing ads on the Google home page, but the ads are specific to adult sites and pornography.Here is a sc"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-home-porn-ad-15211.html>