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.
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.
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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