1. mediasession api

2. mediasession api: metadata

3. mediasession api: playbackstate

4. mediasession api: `setactionhandler()`

5. mediasession api: `setactionhandler()`: `"hangup"` type

6. mediasession api: `setactionhandler()`: `"nextslide"` type

7. mediasession api: `setactionhandler()`: `"nexttrack"` type

8. mediasession api: `setactionhandler()`: `"pause"` type

9. mediasession api: `setactionhandler()`: `"play"` type

10. mediasession api: `setactionhandler()`: `"previousslide"` type

11. mediasession api: `setactionhandler()`: `"previoustrack"` type

12. mediasession api: `setactionhandler()`: `"seekbackward"` type

13. mediasession api: `setactionhandler()`: `"seekforward"` type

14. mediasession api: `setactionhandler()`: `"seekto"` type

15. mediasession api: `setactionhandler()`: `"skipad"` type

16. mediasession api: `setactionhandler()`: `"stop"` type

17. mediasession api: `setactionhandler()`: `"togglecamera"` type

18. mediasession api: `setactionhandler()`: `"togglemicrophone"` type

19. mediasession api: setcameraactive

20. mediasession api: setmicrophoneactive

21. mediasession api: `setpositionstate()`

22. navigator api: mediasession