It doesn't support: headings, paragraphs, lists (ordered or not), labelled links, tables, images, footnotes, images (you can only use the image upload feature which puts a single image below a comment).
It also has a limit to 2000 char (4000 with nitro), which can be rather low when posting code snippets.
I hadn't noticed some of those. I don't use Discord a ton, just enough to know it works better than Slack I guess, at least what they do support uses markdown syntax.
Not even remotely.
Discord supports:
* fenced code blocks (but not indentation)
* quoting, a single level (nested quotes don't work, properly replying to other comments is painful)
* inline decorations (italics, bold, underline, strikethrough, code)
* inline spoilers (an extension)
* disabling autolinking (an other extension)
It doesn't support: headings, paragraphs, lists (ordered or not), labelled links, tables, images, footnotes, images (you can only use the image upload feature which puts a single image below a comment).
It also has a limit to 2000 char (4000 with nitro), which can be rather low when posting code snippets.