编辑下面的代码:【加编码】
<html> <head> <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">Button 1</button> <button id="b2">Button 2</button> <button id="b3">Button 3</button> <button id="b4">Button 4</button> <p><b>Note:</b> The nav- properties are currently supported only in Opera. Hold down the Shift key while navigating with the arrow keys.</p> </body> </html>
结果: 【此窗口】 帮助?
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