pre元素演示

        <!DOCTYPE html>
        <html>
        <head>
            <title>pre元素演示</title>
            <meta charset="utf-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <meta name="keywords" content="小甲鱼,Web开发,HTML5,CSS3,Web编程教学">
            <meta name="description" content="《零基础入门学习Web开发》案例演示">
            <meta name="author" content="小甲鱼">
        </head>
        <body>
            <!-- 演示pre元素的使用 -->
        </body>
        </html>