<!DOCTYPE html>
<html>
<head>
<title>Replace Node Example</title>
</head>
<body>
<div id="oldElement">This element will be replaced. <button onclick="replaceElement()">Replace</button></div>
<script>
function replaceElement() {
let newNode = document.createElement('div');
newNode.textContent = 'This is a replacement.';
let oldNode = document.getElementById('oldElement');
oldNode.parentNode.replaceChild(newNode, oldNode);
}
</script>
</body>
</html>