1. Dart
2. dart:html
3. ServiceWorkerRegistration
4. active property

ServiceWorkerRegistration class

1. Properties
2. active
3. backgroundFetch
4. hashCode
5. installing
6. navigationPreload
7. on
8. paymentManager
9. pushManager
10. runtimeType
11. scope
12. sync
13. waiting
14. Methods
15. addEventListener
16. dispatchEvent
17. getNotifications
18. noSuchMethod
19. removeEventListener
20. showNotification
21. toString
22. unregister
23. update
24. Operators
25. operator ==

ServiceWorker? get active native;