Steps:
1. Reference Jquery
2. If it is IE, instance ActiveXObject; Firefox, instance DOMParser.
3. Processing
<%@ Page Language ="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="XmlDom._Default" %>
< /html>
Under FireFox, I found during testing that if the XML string is given directly to Jquery, Jquery can also process it directly; but not under IE. As below code.