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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.vtt"> 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> </html>