In the article “Fresher service workers, by default”, Jeff Posnick mentions:
Every time […] a service worker is "woken up" via a push or sync event, the browser will, in parallel, request […] updates to the service worker script.
Is it actually part of the W3C Service Workers Spec? I can’t seem to find it in the current Nightly draft.
Since when this has been supported by Chrome? How about other browsers?