<!DOCTYPE html>
<html>
<head>
<style>
#cc {
font-size: 20px;
color: red;
}
</style>
</head>
<body>
<p id="demo">Click one button to add text to this paragraph, click the other button to normalize the paragraph.</p>
<button onclick="addTextNode()">Add a Text Node</button>
<button onclick="normPara()">Normalize the paragraph</button>
<p>The paragraph above has <span id="cc">1</span> child node(s).</p>
<script>
function addTextNode() {
var x = document.createTextNode(" Click again.");
var y = document.getElementById("demo");
y.appendChild(x);
var x = document.getElementById("cc");
x.innerHTML = y.childNodes.length;
}
function normPara() {
var x = document.getElementById("demo");
x.normalize();
var y = document.getElementById("cc");
y.innerHTML = x.childNodes.length;
}
</script>
</body>
</html>