CloseWatcher custom-layer lab

Pure deterministic state machine plus a separately labeled native observation panel. CloseWatcher supplies requests, not roles, modality, focus management, or dialog semantics.

Pure simulator input

At most 8 layers and 64 fixed-catalog events

Layer stack

Timeline

Accessibility responsibility checklist

Canonical receipt

Optional native observation

These user-operated buttons create at most one real watcher and log browser-observed method/event order. Programmatic requests are not physical Android-back evidence.