Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html> 
<html> 
<body> 

<video id="myVideo" width="320" height="240" controls>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
  Your browser does not support the video tag.
</video><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("myVideo");

function enableMute() { 
    x.muted = true;
}
 
function disableMute()  
    muted = false;
}
 
function checkMute() { 
    alert(x.muted);
} 
</script> 

</body> 
</html>