That playground is cool. I wonder if there are any 2-way playgrounds where the right side is also editable using a Word / Google Docs style interface (and the c

That playground is cool. I wonder if there are any 2-way playgrounds where the right side is also editable using a Word / Google Docs style interface (and the changes are reflected in the code-style interface on the left). I've always wanted something like that for teaching non-technical people the basics of Markdown. Bonus points if it's collaborative.