Use `nuvolaruntime -D` to load a web app script from the current working directory. Previously, `nuvola -A APPS_DIRECTORY -a APP_ID` was used and it is no longer supported. I believe the new way is more convenient.
ADK contains a work-in-progress Chromium backend. However, WebKitGTK is still the default one and you need to set `NUVOLA_USE_CEF=true` to use CEF instead. Please test your scripts with CEF as the WebKit backend will be later disabled (maybe in Nuvola 4.11).
WebKitGTK is no longer built with MSE support. I've given up to make it work.
ADK includes Standard JS style checker. You can use `standard --fix` to convert your script. It will be later mandatory.