Please Take note that isSemantic.Web won't validate markup that contains other vocabularies In addition to Schema.org; this sort of markup will be revealed in On the subsequent monitor, enter a website page’s URL or HTML supply code made up of the content that wants markup. That's why it can be https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html