Wait can you guys block-quote?
@nonlinear yes, the instance I am on supports Markdown formatting. I don’t fully understand how it works, but apparently the Mastodon (and Akkoma, in my case) server supports limited formatting in the post body with a subset of HTML which is simple enough to be automatically converted to plain text for clients that do not support formatted text.
If you configure your user settings to allow Markdown formatting, the server will automatically translate your posts to HTML and store that on the server. My previous Mastodon instance supported raw HTML formatting, but it would strip away unsupported HTML tags. My current instance only allows plaintext or Markdown.