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

label · WebPlatform Docs

label Summary

Returns the label of the given track, if known, or the empty string otherwise.

Property of apis/audio-video/AudioTrackapis/audio-video/AudioTrack

Syntax

Note: This property is read-only.

var result = AudioTrack.label;
Return Value

Returns an object of type StringString

Examples
<video id="video1" controls  >
    <source src="http://ie.microsoft.com/testdrive/Videos/BehindIE9ModernWebStandards/Video.mp4">
    <track id="entrack" label="English subtitles" kind="captions" src="entrack.vtt" srclang="en" default>
    <track id="sptrack" label="Spanish subtitles" kind="captions" src="estrack.vtt" srclang="es">
    <track id="detrack" label="German subtitles" kind="captions" src="detrack.vtt" srclang="de">
  </video>
  <br />
  <button id="gettracks" >View text tracks</button>
  <div id="display"></div>

  <script>
    document.getElementById("gettracks").addEventListener("click", function () {
      var display = document.getElementById("display");
      display.innerHTML = "";
      var mytracks = document.getElementById("video1").textTracks;  
      for (var i = 0; i < mytracks.length; i++) {
        display.innerHTML += (mytracks[i].label + "<br/>");  
      }
    }, false);
</script>

View live example

Related specifications
W3C HTML5 Specification
W3C Editor’s Draft
Attributions

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