This is easily done by including all the user interface controls for a screen inside of a separate element.

这很容易实现，只需将一个屏幕的所有用户界面控件包含在一个单独的 元素中。

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These values, which we can also call politeness levels, specify what a screen reader should do when the element value is updated.

我们也可以将这些值称作“礼貌级别”，它们指定了当元素值更新时屏幕阅读器的响应操作。

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Every element on the screen that has no direct semantic or obvious structural character can be misunderstood as a navigational control.

屏幕上的每一个元素并没有直接或明显的结构性特征，都有可能被误解为导航控制。

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Xbox viewers can also access additional Academy Awards information on a smartphone or tablet with the free Xbox SmartGlass app, bringing a second screen element to the Oscars.

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