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<html>
<head>
<meta charset="utf-8">
<title>高手教程(study.p2hp.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>
<button id="b1">按钮1</button>
<button id="b2">按钮2</button>
<button id="b3">按钮3</button>
<button id="b4">按钮4</button>
<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>