<html>
<div id="target">
<p>This is some text</p>
</div>
<script>
//GET
var divElement = document.getElementById("target").innerHTML;
//CHANGE
var heading = '<h1>Example text</h1>';
document.getElementById("target").innerHTML = heading;
//TO MAKE DIV EMPTY
document.getElementById("target").innerHTML = '';
</script>
</html>