Live Demo: create HTML button using js

<!DOCTYPE html>
<html>
<body>  
  <p> click on "create btn" for creating HTML button </p>
  <button onclick="create_b()">create btn</button>
   <script>
	 function create_b() {
     let btn = document.createElement("button");
	 btn.innerHTML = "Submit";
	 btn.id="buttonID";
	 btn.type="submit";
	 btn.name="formsubmit";
     document.body.appendChild(btn);
	 }
   </script>
</body>
</html>