<!DOCTYPE html>
<html>
<script>

function boom()
{
    audio1 = document.createElement("audio");
    (audio1).appendChild(document.createElement("source"));
    (audio1).appendChild(document.createElement("source"));
    setTimeout(function() {
        audio2 = document.createElement("audio");
        audio2.appendChild(audio1);
    }, 100);
}

</script>
<body onload="boom();"></body>
