In other threads I've been describing a method to allow live code snippets to be embedded in reveal.js export, using klipse (
https://github.com/viebel/klipse). I have to say it feels somewhat transformative to me, and I wonder if it would be worth integrating into ox-html. I'd be happy to hack together a patch but I wanted to ask if anyone else likes the idea. The great thing about putting it into ox-html instead of building a derived mode is that the other derived mode would potentially inherit the functionality directly.