I can register service worker via iframe. When I try to run "pushManager.subscribe" I have:
DOMException: Registration failed - permission denied
This problem is only in Chrome via iframe. It works good in Firefox. And it works good without iframe in Chrome
Long story short, you can't! The path you are registering service worker on must be opened (be a top level domain) for it to register a service worker. One way to achieve this is:
suppose your iframe looks like this:
<iframe src="https://example.com"></iframe>
use postMessage to communicate with iframe and ask for permission and then window.open("https://example.com/") to register the service-worker and fetch the token.
Hope this helps :)