TextTrack interface—part of the API for handling WebVTT (text tracks on media presentations)—describes and controls the text track associated with a particular
This interface also inherits properties from
TextTrackCueListobject listing the currently active set of text track cues. Track cues are active if the current playback position of the media is between the cues' start and end times. Thus, for displayed cues such as captions or subtitles, the active cues are currently being displayed.
TextTrackCueListwhich contains all of the track's cues.
A string which identifies the track, if it has one. If it doesn't have an ID, then this value is an empty string (
""). If the
TextTrackis associated with a
<track>element, then the track's ID matches the element's ID.
Returns a string which indicates the track's in-band metadata track dispatch type.
Returns a string indicating what kind of text track the
TextTrackdescribes. It must be one of the permitted values.
A human-readable string which contains the text track's label, if one is present; otherwise, this is an empty string (
""), in which case a custom label may need to be generated by your code using other attributes of the track, if the track's label needs to be exposed to the user.
A string which specifies the text language in which the text track's contents is written. The value must adhere to the format specified in RFC 5646: Tags for Identifying Languages (also known as BCP 47), just like the HTML
langattribute. For example, this can be
"en-US"for United States English or
"pt-BR"for Brazilian Portuguese.
A string specifying the track's current mode, which must be one of the permitted values. Changing this property's value changes the track's current mode to match. The default is
disabled, unless the
defaultboolean attribute is set to
true— in which case the default mode is
This interface also inherits methods from
TextTrackCue interface is an abstract class used as the parent for other cue interfaces such as
VTTCue. Therefore, when adding or removing a cue you will be passing in one of the cue types that inherit from
Fired when cues are entered and exited. A given text cue appears when the cue is entered and disappears when the cue is exited. Also available via the
The following example adds a new
TextTrack to a video, then sets it to display using
let video = document.querySelector("video"); let track = video.addTextTrack("captions", "Captions", "en"); track.mode = "showing";
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