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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <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> <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> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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