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<!DOCTYPE html>
<html>
<body>
<p>Click the button to create a FORM and an INPUT element.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  var x = document.createElement("FORM");
  x.setAttribute("id", "myForm");
  document.body.appendChild(x);
  var y = document.createElement("INPUT");
  y.setAttribute("type", "text");
  y.setAttribute("value", "Donald");
  document.getElementById("myForm").appendChild(y);
}
</script>
</body>
</html>