撤销令取消，宣告无罪；法院命令的撤销。
即使宣告的或评估的不透明度为0，项目仍会参与输入事件和命令，且可能可设定焦点。
Even if the declared or evaluated opacity is 0, an element still participates in input events and commands, and is potentially focusable.
描述如何宣告式地、命令式地或直接地存取主体物件来实作安全性检查。
Describes how to implement security checks declaratively, imperatively, or by directly accessing a principal object.
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