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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="enableMute()" type="button">Mute sound</button>
<button onclick="disableMute()" type="button">Enable sound</button>
<button onclick="checkMute()" type="button">Check muted status</button>
<script>
var x = document.getElementById("myAudio");
function enableMute() { 
  x.muted = true;
} 
function disableMute() { 
  x.muted = false;
}
 
function checkMute() { 
  alert(x.muted);
} 
</script> 
</body> 
</html>