I have always wanted a rich text editor where you could see the markdown as well as the formatting it produces at the same time (and in the same edit pane... ie

I have always wanted a rich text editor where you could see the markdown as well as the formatting it produces at the same time (and in the same edit pane... ie not realtime rendering in a pane above). That is if you typed: **blah** It would show blah and still show the asterisk but in bold (apologies for using code format but HN will strip the asterisks). There are of course some editor plugins, and IDEs that do this but I haven't seen one on the web. EDIT Oh apparently there is stackedit (I hadn't googled in awhile).