You can install it as a Progressive Web App in Chromium based browsers, the GNOME web browser and anything else that supports PWAs (firefox with the special extension, for example) and as a PWA it does run offline. But you cannot download it yourself and run it manually as the code is not available to download.
You can install it as a Progressive Web App in Chromium based browsers, the GNOME web browser and anything else that supports PWAs (firefox with the special extension, for example) and as a PWA it does run offline. But you cannot download it yourself and run it manually as the code is not available to download.