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<!DOCTYPE html> <html> <body> <audio controls> <source id="mySource" src="horse.mp3" type="audio/mpeg"> <source src="horse.ogg" type="audio/ogg"> Your browser does not support the audio element. </audio> <p>Click the button to return the value of the type attribute of the media resource.</p> <p id="demo"></p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("mySource").type; document.getElementById("demo").innerHTML = x; } </script> </body> </html>