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FORMエレメント以外でfocusイベントを発生させる方法

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例えば<div>でfocusイベントを発生させたい場合。
これやりたくて先日小一時間悩んだ。
解は簡単で、tabindex属性をつければOK。<div tabindex="0">みたいに。そうすればそのエレメントでfocus,blurイベントが発生するようになる。

tabindex属性はグローバル属性なので、すべてのエレメントにつけることができる。

以上

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