insert Properties

<!DOCTYPE html>
<html>
<body>

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

<p>This method inserts a specified text as HTML, into a specified position in the document.</p>

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

<p>Click the button to insert a span inside the header:</p>

<button onclick="myFunction()">Insert a span</button>

<script>
function myFunction() {
  var h = document.getElementById("myH2");
  h.insertAdjacentHTML("beforeend", "<span style='color:red'>My span</span>");
}
</script>

</body>
</html>