That is cool no doubt, but to be clear I was referring to rendering markdown in the editor itself, as you're typing. (Not in a separate pane or browser, which almost every Markdown editor does.) For example, if you type asterisk-foo-asterisk-space you should (in the editor) see an italicized foo followed by a space, and if you move your cursor to the “foo” you should be able to see the asterisks and edit the syntax again.