在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.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>
源代码

动行结果
