1. Dart
2. dart:html
3. ServiceWorkerContainer
4. controller property

##### ServiceWorkerContainer class

1. Properties
2. controller
3. hashCode
4. on
5. onMessage
6. ready
7. runtimeType
8. Methods
9. addEventListener
10. dispatchEvent
11. getRegistration
12. getRegistrations
13. noSuchMethod
14. register
15. removeEventListener
16. toString
17. Operators
18. operator ==
19. Constants
20. messageEvent

description

# controller property Null safety

ServiceWorker? controller

## Implementation

    ServiceWorker? get controller native;