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<!DOCTYPE html> <html> <body> <p>This example demonstrates how to assign an "onvolumechange" event to an audio element.</p> <p>Try to change the volume in the bottom right corner.</p> <audio controls onvolumechange="myFunction()"> <source src="horse.ogg" type="audio/ogg"> <source src="horse.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <script> function myFunction() { alert("The volume has been changed!"); } </script> </body> </html>