<commit_before><!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="utf-8">
        <title>Hello World</title>
        <link rel="stylesheet" href="styles/main.css">
        <script src="scripts/main.js"></script>
    </head>
    <body>
        Hello World!
    </body>
</html><commit_msg>add header and footer !<commit_after><!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="utf-8">
        <title>Hello World</title>
        <link rel="stylesheet" href="styles/main.css">
        <script src="scripts/main.js"></script>
    </head>
    <body>

        <header>
            <hgroup>
                <h1>my blog name</h1>
                <h2>my blog slogan</h2>
            </hgroup>

            <nav>
                <ul></ul>
            </nav>
        </header>

        <nav>
            <h1>link heading</h1>
            <ul><!-- link list --></ul>
        </nav>

        <section>
            <article>
                <heaer>
                    <h1>article title</h1>
                    <div class="meta">
                        published by materliu on
                        <time datatime="2012-05-01T12:00+00:00">you born
                            day</time>
                    </div>
                </heaer>
                <section></section>
            </article>
        </section>

        <footer>
            <ul><!-- footer links --></ul>
            <!-- copyright info -->
        </footer>
    </body>
</html>
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