dom normalize

var element = document.createElement("div");
element.className = "message";
var textNode = document.createTextNode("Hello wordl!");
element.appendChild(textNode);
var anotherTextNode = document.createTextNode("Yippee!");
element.appendChild(anotherTextNode);
document.body.appendChild(element);
alert(element.childNodes.length);  //2
element.normalize();
alert(element.childNodes.length);  //1
alert(element.firstChild.nodeValue);  //"Hello world!Yippee!"