trycss3_nav 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</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
{
 
 
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运行结果
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