Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to create an OBJECT and a PARAM element with an embedded audio file.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var x = document.createElement("OBJECT");
    x.setAttribute("data", "horse.wav");
    x.setAttribute("id", "myObject");
    document.body.appendChild(x);

    var y = document.createElement("PARAM");
    y.setAttribute("name", "autoplay");
    y.setAttribute("value", "true");
    document.getElementById("myObject").appendChild(y);
}
</script>

</body>
</html>