DOM文档层级结构

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<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.0//EN""http://www.w3.org/TR/REC-html140/strict.dtd">
<html>
    <head>
        <meta http-equiv="content-type" content="text/html;charset=gb2312">
        <title>DOM文档层级结构</title>
    </head>
    <body>
        <h1>Test!</h1>
        <!--NOTE!-->
        <p>
            Welcome to
            <em>DOM</em>
            World!
        </p>
        <ul>
            <li>Newer</li>
        </ul>
    </body>
</html>
<!--
    浏览器载入该文档后,根据DOM中定义的结构,将其以以下所示的结点树的形式表示出来
    html
        head
            meta
            title
                DOM文档层级结构
        body
            h1
                Test!
            NOTE!
            p
                Welcome to
                em
                    DOM
                World!
            ul
                li
                    Newer
-->