Edit This Code:
<!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>


Result:
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