You have to put Thimble into context. It's a tool for teaching basic Web skills to people new to the field, and part of the Mozilla Learning initiative[0]. I'm

You have to put Thimble into context. It's a tool for teaching basic Web skills to people new to the field, and part of the Mozilla Learning initiative[0]. I'm not sure it's intended for actual development. [0] https://teach.mozilla.org/ https://teach.mozilla.org/ EDIT: forgot the link