按下向下键时，应该显示弹出列表。

When the down key is pressed, the pop-up list should be shown.

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一旦弹出列表，您可以用您的鼠标或键盘从列表中选择选项。

Once the list is populated, you can use your mouse or your keyboard to select an option from the list.

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选择此复选框后，在“源”视图编辑器中编辑标记时会显示有效元素、属性、特性或方法的弹出列表。

When this check box is selected, pop-up lists of valid elements, properties, attributes, or methods are displayed as you edit markup in the Source view editor.

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