Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to create a FIGURE element containing an IMG element.</p>

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

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

    var y = document.createElement("IMG");
    y.setAttribute("src", "img_pulpit.jpg");
    y.setAttribute("width", "304");
    y.setAttribute("width", "228");
    y.setAttribute("alt", "The Pulpit Rock");

    x.appendChild(y);
}
</script>

</body>
</html>