What excites me about this approach is that it has the potential to make demos that are also accessible to blind people. It would take some work though, possibl

What excites me about this approach is that it has the potential to make demos that are also accessible to blind people. It would take some work though, possibly even including support from browsers and screen readers. The pseudo-focus and pseudo-caret features in particular are problematic. Also, blind people might need a playback mode that advances the recording manually frame by frame (only counting frames that actually include changes), rather than playing back in real time.