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    Focus management in HTML リダイレクト 1

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    In the HTML5 working draft, the activeElement DOM attribute and the hasFocus() DOM method give the programmer the ability to have better control of the interactivity of the page due to the user's actions. For example, both of them can be used for statistical usage purposes, tracking the number of clicks on certain links of a page, measuring the amount of time an element is focused, and so forth. In addition, when combined with AJAX technology, they help minimize the number of requests to the server, depending on the user activity and the page layout.

    ブラウザ実装状況

    機能 Chrome Firefox (Gecko) Internet Explorer Opera Safari
    基本サポート ? 3.6 (1.9.2) ? ? ?
    機能 Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    基本サポート ? 4.0 (2.0) ? ? ?

    Browser-specific notes

    Gecko notes

    Gecko 8.0 note
    (Firefox 8.0 / Thunderbird 8.0 / SeaMonkey 2.5)

    Starting in Gecko 8.0 (Firefox 8.0 / Thunderbird 8.0 / SeaMonkey 2.5), Firefox now draws a focus ring around any element when it has a tabindex value greater than 0, instead of only a limited subset of items. There are only a few exceptions to this rule:

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