The “Standards” section of https://cosmos.delta.chat/ no longer links to
Apologies if this was discussed and done intentionally for reasons and I have missed seeing both.
The contents of that link, especially the Chatmail standard draft spec, were a major factor in convincing me to use the system, and I mention it when talking about DC to others (if they don’t know what an open standard is and why it is a good thing then they need to learn, and everyone knows about e-mail and uses HTML).