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                # CSS3 nav-index 屬性 ## 實例 規定在使用方向鍵時向何處導航: ``` 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; } ``` ## 瀏覽器支持 目前只有 Opera 支持 nav-index 屬性。 ## 定義和用法 nav-index 屬性規定元素的連續導航次序 ("tabbing order")。 | 默認值: | auto | | --- | --- | | 繼承性: | no | | --- | --- | | 版本: | CSS3 | | --- | --- | | JavaScript 語法: | _object_.style.navIndex=2 | | --- | --- | ## 語法 ``` nav-index: auto|_number_|inherit; ``` | 值 | 描述 | | --- | --- | | auto | 由瀏覽器分配元素的導航鍵控制次序。 | | _number_ | 指示元素的導航鍵控制次序。1 代表第一個。 | | inherit | 規定應從父元素繼承 nav-index 屬性的值。 |
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