insert Properties

<!DOCTYPE html>
<html>
<body>

<h1>HTML DOM insertAdjacentElement() Method</h1>

<p>This method inserts a specified element, into a specified position.</p>

<h2 id="myH2">My Header</h2>

<span style="color:red">My span</span>

<p>Click the button to insert the red span before the header:</p>

<button onclick="myFunction()">Move span</button>

<script>
function myFunction() {
  var s = document.getElementsByTagName("span")[0];
  var h = document.getElementById("myH2");
  h.insertAdjacentElement("beforebegin", s);
}
</script>

</body>
</html>