HTMLMediaElement: waitingforkey event

The waitingforkey event is fired at a media element when it is first unable to play because it needs a key to decode the following data, and playback is stopped.

If the video frame and/or audio data for the current playback position have been decoded, readyState is set to HAVE_CURRENT_DATA. Otherwise, including if the data was previously available but isn't anymore, the readyState is set to HAVE_METADATA.

addEventListener("waitingforkey", (event) => {});

onwaitingforkey = (event) => {};