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<!DOCTYPE html>
<html>
<body>
<audio id="myAudio" controls>
  <source src="horse.ogg" type="audio/ogg">
  <source src="horse.mp3" type="audio/mpeg">
  <track src="demo_sub.html">
  Your browser does not support the audio element.
</audio>
<p>Click the button to get the number of available text tracks.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myAudio").textTracks.length;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_audio_texttracks by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:16:49 GMT -->
</html>