While support for local disk images and other local resources can work on some mobile devices, I don't think the use cases warrant the extra (largely wasted) screen space
HTML controls with bindings are now identified by the single class attribute of "{APPCLASS}-binding" instead of the somewhat arbitrary "{APPCLASS}-input" or "{APPCLASS}-output" classes
The old VisiCalc demo state file (state.json) was triggering a spurious (keyboard?) event that would generate a beep and wipe the copyright message; I'm kind of curious what was causing that, but the simplest solution for now is to generate a new state.json.