I hope not as Service Workers is an awful technology.

It is completely hostile to users. If I close a web page I expect everything related to that web page to stop. Immediately. I don't expect there to be lingering background threads consuming battery life, network data and disk storage. And in Chrome you can only discover service workers by enabling a Debug mode and memorising a specific URL. Exactly how does a non-developer figure out what is going on ?

If Apple had any sense they would ban service workers and instead propose use case specific, tightly focused and managed APIs that focus on security and battery life first.

Also just a hint at a future where Botnets are running in your browser:

https://sakurity.com/blog/2016/12/10/serviceworker_botnet.ht...