[jedschmidt]

A service worker would work fine; the connection would be instantiated from the SW and each window/worker could communicate with it via navigator.serviceWorker.

[esprehn]

That doesn't work because browsers have duration limits on ServiceWorkers:

https://github.com/w3c/ServiceWorker/issues/980#issuecomment...

Also unfortunately Chrome doesn't keep SharedWorker alive after a navigation (Firefox and Safari do):

https://issues.chromium.org/issues/40284712

Hopefully Chrome will fix this eventually, it really makes it hard to build performant MPAs.

[jedschmidt]

In my experience, as long as a controlled window is communicating with the SW, the connection will remain alive.