VTTCue

The VTTCue interface of the WebVTT API represents a cue that can be added to the text track associated with a particular video (or other media).

A cue defines the text to display in a particular timeslice of a video or audio track, along with display properties such as its size, alignment, and position.

Constructor

• VTTCue()
  • : Returns a newly created VTTCue object that covers the given time range and has the given text.

Instance properties

This interface also inherits properties from TextTrackCue.

• region
  • : A VTTRegion object describing the video’s sub-region that the cue will be drawn onto, or null if none is assigned.
• vertical
  • : An enum representing the cue writing direction.
• snapToLines
  • : true if the line attribute indicates an integer number of lines or false if it represents a percentage of the video size. This is true by default.
• line
  • : Represents the line positioning of the cue. This can be the string auto or a number whose interpretation depends on the value of snapToLines.
• lineAlign
  • : An enum representing the alignment of the VTT cue.
• position
  • : Represents the indentation of the cue within the line. This can be the string auto, a number representing the percentage of the region, or the video size if region is null.
• positionAlign
  • : An enum representing the alignment of the cue. This is used to determine what the position is anchored to. The default is auto.
• size
  • : Represents the size of the cue, as a percentage of the video size.
• align
  • : An enum representing the alignment of all the lines of text within the cue box.
• text
  • : A string representing the contents of the cue.

Instance methods

• getCueAsHTML()
  • : Returns the cue text as a DocumentFragment.

Example

HTML

The following example adds a new TextTrack to the video, then adds cues using the addCue() method, with a VTTCue object as the value.

<video controls src="/shared-assets/videos/friday.mp4"></video>

CSS

video {
  width: 420px;
  height: 300px;
}

JavaScript

let video = document.querySelector("video");
let track = video.addTextTrack("captions", "Captions", "en");
track.mode = "showing";
track.addCue(new VTTCue(0, 0.9, "Hildy!"));
track.addCue(new VTTCue(1, 1.4, "How are you?"));
track.addCue(new VTTCue(1.5, 2.9, "Tell me, is the lord of the universe in?"));
track.addCue(new VTTCue(3, 4.2, "Yes, he's in - in a bad humor"));
track.addCue(new VTTCue(4.3, 6, "Somebody must've stolen the crown jewels"));
console.log(track.cues);

Result

Specifications

Browser compatibility