An equivalent for swr.getNotifications for declarative notifications?

[saschanaz]

What is the issue with the Notifications API Standard?

One may want to close all previous notifications when the page is accessed when the notification inbox is opened (e.g. emails or notifications in social media). For the SW-bound notifications we have swr.getNotifications() but not for others.

We might want to restore Notification.get() for all SW-unbound notifications, as non-persistent notifications are not really non-persistent for multiple implementations anyway. (#204)