@robinberjon @marcosc's right, it's dropped.
Microdata ~dead. No community.
#IndieWeb uses @microformats.
SEOs are fickle and hack whatever Google advises this year, currently that seems to be DRY-violating JSONLD data islands (reinventing Microsoft’s XML data islands of 15 years ago: tantek.com/2015/020/t2/google-reinvents-microsoft-xml-data-islands).