This is focusing on a specific usecase of a subset of {T31968}.
Mastodon allows verifying URLs in one's profile by using the `rel="me"` microformat. https://microformats.org/wiki/rel-me & https://docs.joinmastodon.org/user/profile/#fields
For example, on https://blog.legoktm.com/ I have `<a rel="me" href="https://wikis.world/@legoktm">Mastodon</a>`. When I add my blog URL to Mastodon, it finds the link to my profile with `rel="me"`, confirming that whoever runs blog.legoktm.com has said they are also
`@legoktm@wikis.world
`.
MediaWiki, for good reasons, does not allow setting arbitrary attributes on `<a>` tags. So we need a way for users to 1) specify profile link(s) and 2) annotate those links with rel="me".
The end goal is that I can put e.g. https://meta.wikimedia.org/wiki/User:Legoktm as a URL item and Mastodon will be able to verify it.
Some prior art:
* https://www.mediawiki.org/wiki/Extension:RelMicroformat
* https://www.mediawiki.org/wiki/Extension:Link_Attributes
Very brief discussion in the thread starting with https://wikis.world/@legoktm/109308814139458603