HackMD already does this. It has a dual-pane view for raw markdown and formatted output, supports WYSIWYG editing, and allows real-time collaboration. Surprised

HackMD already does this. It has a dual-pane view for raw markdown and formatted output, supports WYSIWYG editing, and allows real-time collaboration. Surprised no one mentioned it. - [HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing](https://hackmd.io/ https://hackmd.io/)