Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
table, td {
    border: 1px solid black;
}
</style>
</head>
<body>

<p>Click the button to create a TABLE, a TR and a TD element.</p>

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

<script>
function myFunction() {
    var x = document.createElement("TABLE");
    x.setAttribute("id", "myTable");
    document.body.appendChild(x);

    var y = document.createElement("TR");
    y.setAttribute("id", "myTr");
    document.getElementById("myTable").appendChild(y);

    var z = document.createElement("TD");
    var t = document.createTextNode("cell");
    z.appendChild(t);
    document.getElementById("myTr").appendChild(z);
}
</script>

</body>
</html>