iOS/iPadOS: add this page to the Home Screen and open it from there.
Registrations
A
B
C
Send
Run this in the repository on the PC: six pushes, each registration as Mastodon 4.4+ (aes128gcm) and Fedibird (aesgcm) send them.
Log
Checks
Cold subscribe: with no permission and no registration yet, one tap on A's Subscribe asks, then subscribes.
B's and C's Subscribe subscribe too (no second prompt).
Send: six notifications arrive (A, B and C, both encodings).
With this page open in the background, send and click a notification: this page comes to the front and logs "click" and "focused".
Close this page (iOS: swipe the app away), send and click: the page opens with an "Opened by" line (iOS: inside the Home Screen app).
Restart the browser (iOS: close the app or restart the device), do not open this page, send: the notifications arrive.
Server formats: send with a all appended to the command, with the device awake (Pleroma and Akkoma send TTL 0): five notifications arrive, one per server.