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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"> Your browser does not support the audio element. </audio> <p>Click the button to add a new text track.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The addTextTrack method is not supported in any major browsers.</p> <script> var x = document.getElementById("myAudio"); function myFunction() { var y = x.addTextTrack("caption"); y.addCue(new TextTrackCue("Test text", 01.000, 04.000,"","","",true)); } </script> </body> </html>