Make the app progressive
See: https://developers.google.com/web/progressive-web-apps/checklist
Perhaps, take a PWA tutorial first: https://www.udacity.com/course/intro-to-progressive-web-apps--ud811
See: https://developers.google.com/web/progressive-web-apps/checklist
Perhaps, take a PWA tutorial first: https://www.udacity.com/course/intro-to-progressive-web-apps--ud811