I am trying to understand browser support for event pushsubscriptionchange.
I found this old blog post of chrome (2016) saying that support starts from version 54.
On MDN page it’s reported that only Safari desktop fully supports it.
CanIUse reports that only Safari desktop and Safari iOS supports it, while Chrome as never done.
Blog post from SitePoint 2018 seems to say that the event is widely supported.
web.dev (wich is Google) on teaching how to handle subscription expiration does not cite it.