CSS3 多媒体查询实例 - 自学教程(runoops.com)

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>CSS3 多媒体查询实例 - 自学教程(runoops.com)</title>
    <style>
        button {
            position: absolute;
        }

button#b1 {
            top: 20%;
            left: 25%;
            nav-index: 1;
            nav-right: #b2;
            nav-left: #b4;
            nav-down: #b2;
            nav-up: #b4;
        }

button#b2 {
            top: 40%;
            left: 50%;
            nav-index: 2;
            nav-right: #b3;
            nav-left: #b1;
            nav-down: #b3;
            nav-up: #b1;
        }

button#b3 {
            top: 70%;
            left: 25%;
            nav-index: 3;
            nav-right: #b4;
            nav-left: #b2;
            nav-down: #b4;
            nav-up: #b2;
        }

button#b4 {
            top: 40%;
            left: 0%;
            nav-index: 4;
            nav-right: #b1;
            nav-left: #b3;
            nav-down: #b1;
            nav-up: #b3;
        }
    </style>
</head>

<body>

<p><b>注释：</b>目前只有 Opera 支持 nav-* 属性。当您使用方向键导航时，请同时按下 Shift 键。</p>

</body>

</html>