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Showing content from https://webplatform.github.io/docs/apis/audio-video/TextTrackCue/startTime below:

startTime · WebPlatform Docs

startTime Summary

The text track cue start time, in seconds.

Property of apis/audio-video/TextTrackCue apis/audio-video/TextTrackCue

Syntax

var result = TextTrackCue.startTime;
TextTrackCue.startTime = value;

Return Value

Returns an object of type NumberNumber

Examples

This example adds start times, end times, and captions to a track.

<!DOCTYPE html >
<html >
  <head>
    <title>Add Text Tracks example</title>
</head>
<body>

<video id="video1" controls="controls" muted="muted">
     
  <source src="http://ie.microsoft.com/testdrive/Videos/BehindIE9ModernWebStandards/Video.mp4" />
  HTML5 Video not supported
</video>

 <script>
   var video = document.getElementById("video1");
   var startTime, endTime, message;
   var newTextTrack = video.addTextTrack("captions", "sample");
   newTextTrack.mode = newTextTrack.SHOWING; 
   
   for (var i = 0; i < 30; i++) {
     startTime = i * 5;
     endTime = ((i * 5) + 5);
     message = "This is number " + i;
     newTextTrack.addCue(new TextTrackCue(startTime, endTime, message));
   }
   video.play();
  </script>
</body>
</html>

Related specifications

W3C HTML5 Specification: W3C Editor’s Draft

Attributions

Microsoft Developer Network: Windows Internet Explorer API reference Article

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