Found 3 pages:

# Page Tags and summary
1 Event reference Event, Overview, Reference
This topic provides an index to the main sorts of events you might be interested in (animation, clipboard, workers etc.) along with the main classes that implement those sorts of events. At the end is a flat list of all documented events.
2 periodicsync Offline, PWA, Periodic Background Synchronization, ServiceWorkerGlobalScope, events
The periodicsync event of the ServiceWorkerGlobalScope interface is fired at timed intervals, specified when registering a PeriodicSyncManager.
3 touchstart Reference, events, touch, touchstart
The touchstart event is fired when one or more touch points are placed on the touch surface.