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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><br> <button onclick="getMuted()" type="button">Is the audio muted by default?</button> <button onclick="setToMuted()" type="button">Set audio to be muted by default, and reload video</button> <script> var x = document.getElementById("myAudio"); function getMuted() { alert(x.defaultMuted); } function setToMuted() { x.defaultMuted = true; x.load() } </script> </body> </html>