* Bold, italic, underline, quote blocks and headers in the message body should be possible
* For software developers: syntax-highlighted code blocks should be possible
* Links to youtube videos (and other video sharing platforms) should include the ability to preview and play those videos in the message
* Picture files should be able to be dragged into a message being composed
* Including URLs to images in the body should result in an image preview
* Math equations should be possible (LaTeX syntax or something simpler)