TrackEvent()

The TrackEvent() constructor creates and returns a new TrackEvent object describing an event which occurred on a list of tracks (AudioTrackList, VideoTrackList, or TextTrackList).

type

The type of track event which is described by the object: "addtrack" or "removetrack".

eventInfo Optional

An optional dictionary providing additional information configuring the new event; it can contain the following fields in any combination:

track Optional

The track to which the event refers; this is null by default, but should be set to a VideoTrack, AudioTrack, or TextTrack as appropriate given the type of track.

bubbles Optional

A Boolean indicating whether the event bubbles or not.

cancelable Optional

A Boolean indicating whether or not the event can be canceled.

composed Optional

A Boolean indicating whether or not the event will trigger listeners outside of a shadow root; see Event.composed for more details.

A newly-created TrackEvent object, initialized as described by the inputs to the constructor.