No joke, Emacs has the ability to render in line markdown, essentially the current line is just text, while the rest of the doc is rendered as markdown titles, links, lists, etc. It’s my favourite way of editing markdown but I’ve never found another editor that does markdown like that. Everything else has text and rendered markdown side by side as separate panes, which I personally hate.

Edit: I stand corrected. Neovim has it too: https://github.com/MeanderingProgrammer/render-markdown.nvim