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本文档使用
php.cn手册 发布
文字
语法：
nav-index：auto | <number>
默认值：auto
适用于：所有 enabled 的元素
继承性：无
动画性：否
计算值：指定值
相关属性: <' nav-up '> || <' nav-right '> || <' nav-down '> || <' nav-left '>
取值：
auto：元素的导航焦点顺序由客户端自动分配。
<number>：用浮点数来定义元素的导航焦点顺序。若某元素的该值等于1则意味着该元素最先被导航。当若干个元素的nav-index值相同时，则按照文档的先后顺序进行导航。
说明：
设置或检索对象的导航顺序。
该属性是HTML4/XHTML1中标签属性tabindex的替代品。
只有支持nav-index属性的元素才能参与导航排序。
被禁用的元素将不参与导航排序。
该属性有被w3c标准移除的风险。
对应的脚本特性为navIndex。
兼容性：
| Values | IE | Firefox | Chrome | Safari | Opera | iOS Safari | Android Browser | Android Chrome |
|---|---|---|---|---|---|---|---|---|
| Basic Support | 6.0-11.0 | 2.0-40.0 | 4.0-45.0 | 6.0-8.0 | 15.0-29.0 | 6.0-8.3 | 2.1-4.4.4 | 18.0-42.0 |
示例：
实例
<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>nav-index_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
html,body{margin:0;}
button{position:absolute;}
button#b1{
top:0;left:50%;
nav-index:1;
nav-right:#b2;nav-left:#b4;
nav-down:#b2;nav-up:#b4;
}
button#b2{
top:50%;right:0;
nav-index:2;
nav-right:#b3;nav-left:#b1;
nav-down:#b3;nav-up:#b1;
}
button#b3{
left:50%;bottom:0;
nav-index:3;
nav-right:#b4;nav-left:#b2;
nav-down:#b4;nav-up:#b2;
}
button#b4{
top:50%;left:0;
nav-index:4;
nav-right:#b1;nav-left:#b3;
nav-down:#b1;nav-up:#b3;
}
</style>
</head>
<body>
<div class="test">
<button id="b1">button1</button>
<button id="b2">button2</button>
<button id="b3">button3</button>
<button id="b4">button4</button>
</div>
</body>
</html>
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