1. Dart
2. dart:html
3. BatteryManager
4. level property

BatteryManager class

1. Properties
2. charging
3. chargingTime
4. dischargingTime
5. level
6. hashCode
7. on
8. runtimeType
9. Methods
10. addEventListener
11. dispatchEvent
12. noSuchMethod
13. removeEventListener
14. toString
15. Operators
16. operator ==