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<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>