Last updated: 25 Oct 2019.
Complete history since 12 May 2018 can be found here.

Document history (since 12 May 2018)

For a list of changes in each subdomain please see the index page for each of the subdomains; I try to keep all the indices updated but it's entirely possible this won't remain true by accident (and sometimes because it seems insignificant or I simply cannot be bothered though this is rather unusual).