iframe小案例:实现CSS标签,属性选择器, 以及群组选择器的使用场景

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>iframe后台小案例</title>
    <style>
        /* 标签选择器 */
        nav a {
            font-size: 16px;
            color: black;
            font-weight: bold;
        }
        /* 属性选择器 */
        nav a.index {
            color: orangered;
        }
        /* 群组选择器 */
        nav a.download,
        nav a.technique,
        nav a.community {
            color: green;
        }
        nav a:hover {
            font-size: 1.01em;
            color: orangered;
        }
        iframe {
            width: 100%;
            height: 600px;
            border: none;
            background-color: #efefef;
        }
    </style>
</head>
<body>
    <nav>
        <a href="demo1.html" target="content" class="index">首页</a>
        <a href="demo2.html" target="content" class="video">视频教程</a>
        <a href="demo3.html" target="content" class="study">学习路径</a>
        <a href="demo4.html" target="content" class="php">PHP培训</a>
        <a href="demo5.html" target="content" class="download">资源下载</a>
        <a href="demo6.html" target="content" class="technique">技术文章</a>
        <a href="demo7.html" target="content" class="community">社区</a>
    </nav>
    <iframe src="demo1.html" name="content"></iframe>
</body>
</html>

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