When you touch an element, such as an edit box, in a web page on the iPad, it turns gray while you are touching it.When you touch an element, such as an edit box,
阅读背景：
当您在iPad上触摸Safari中的HTML元素时，它会变为灰色。决定嵌套元素中哪个元素以灰色显示的逻辑是什么？
来源：互联网
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