This is a good use case for service workers and is mentioned in this post from 2016: https://developers.google.com/web/updates/2016/06/sw-readablestreams https:

This is a good use case for service workers and is mentioned in this post from 2016: https://developers.google.com/web/updates/2016/06/sw-readablestreams https://developers.google.com/web/updates/2016/06/sw-readabl... It covers some pros and cos, the main advantages of using an app shell are > whether your web app is best modeled as a single-page application (advantage: App Shell); and on whether you need a model that's currently supported across multiple browsers' stable releases (advantage: App Shell) I think it's reasonable to argue that lots of sites that are SPA's don't need to be, if they can do this instead.