<!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>