MediaControllerThe playback of multiple <video> or <audio> elements can be coordinated by a MediaController instance, for example to synchronize a sign-language interpreter track with the main video track.limitedhttps://www.w3.org/TR/2018/SPSD-html5-20180327/embedded-content-0.html#synchronising-multiple-media-elementshttps://developer.mozilla.org/docs/Web/API/HTMLMediaElement/controllerapi.HTMLMediaElement.controllerapi.MediaControllerapi.MediaController.MediaControllerapi.MediaController.bufferedapi.MediaController.currentTimeapi.MediaController.defaultPlaybackRateapi.MediaController.durationapi.MediaController.mutedapi.MediaController.pauseapi.MediaController.pausedapi.MediaController.playapi.MediaController.playbackRateapi.MediaController.playbackStateapi.MediaController.playedapi.MediaController.seekableapi.MediaController.unpauseapi.MediaController.volumehttps://nowyoucanuse.com/features--mediacontroller.html