此属性不指示元素是否可见。

This property does not indicate whether the element is visible.

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这包括特定的参考颜色，动画，是否某些元素是可见的和布局。

This includes specific references to colours, animations, whether certain elements are visible and the layout.

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获取一个值，该值指示键盘焦点是否在元素边界内的任何地方，包括键盘焦点是否在任何可见子元素的边界内。

Gets a value that indicates whether keyboard focus is anywhere inside the element bounds, including if keyboard focus is inside the bounds of any visual child elements.

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