Yes, it's a pity that AppCache and ServiceWorkers won't be able to support this use case. Also, the data URI trick comes with its own limitations, such as the

Yes, it's a pity that AppCache and ServiceWorkers won't be able to support this use case. Also, the data URI trick comes with its own limitations, such as the fact that the address bar won't present an actual domain name or padlock, so it has a slightly worse user experience than normal websites. One simple way that the web platform could be improved, then, would be to adopt something like the Hashlink proposal[0], which would allow the hash of the initial "bootloader" to be stored in the query string. If this were possible then a simple bookmark would suffice, or a URL sent in an email, as your comment suggests. [0] https://w3c-ccg.github.io/hashlink/ https://w3c-ccg.github.io/hashlink/