We’re using Glitch to teach A-Frame. thimble.mozilla.org has a neat feature where if you include a tutorial.html file, Thimble will include a toggleable pane showing the contents of that tutorial.html file. It’s a fat feature, but it’d be interesting for the future.
Cool idea and thanks for showing how Thimble implements it. We’ll definitely take it into consideration when thinking about future enhancements to the editor