2020-11-15 UTC
# 
@HeNeArXn ↩️ HTML5 refs the list on the microformats wiki instead: https://html.spec.whatwg.org/multipage/links.html#concept-rel-extensions
I'd say make a document (SocialCG note?) proposing it, start using it, then submit that (esp. for IANA, given "anticipatory requests are discouraged" wording re community groups (last README line)) (twitter.com/_/status/1327902710872633344)