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<!DOCTYPE html> 
<html> 
<body> 
<audio id="myAudio1" controls>
  <source src="horse.ogg" type="audio/ogg">
  <source src="horse.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>
<audio id="myAudio2" 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="setMedGroup()" type="button">Set media group for audios</button>
<button onclick="getMedGroup()" type="button">Get media group for audios</button>
<script>
var x = document.getElementById("myAudio1");
var y = document.getElementById("myAudio2");
function setMedGroup() { 
  x.mediaGroup = "test";
  y.mediaGroup = "test";
} 
function getMedGroup() { 
  alert("Audio 1 media group: " + x.mediaGroup +
  ". Audio 2 media group: " + y.mediaGroup);
} 
</script> 
</body> 
</html>