1. Dart
2. dart:html
3. WindowEventHandlers
4. offlineEvent constant

##### WindowEventHandlers class

1. Properties
2. hashCode
3. on
4. onHashChange
5. onMessage
6. onOffline
7. onOnline
8. onPopState
9. onStorage
10. onUnload
11. runtimeType
12. Methods
13. addEventListener
14. dispatchEvent
15. noSuchMethod
16. removeEventListener
17. toString
18. Operators
19. operator ==
20. Constants
21. hashChangeEvent
22. messageEvent
23. offlineEvent
24. onlineEvent
25. popStateEvent
26. storageEvent
27. unloadEvent

description

# offlineEvent constant Null safety

EventStreamProvider<Event> const offlineEvent

## Implementation

    static const EventStreamProvider offlineEvent =
        const EventStreamProvider('offline')