The display property is set to none to hide the control and to block to display the list.
display属性设置为none以隐藏控件，设置为block时则会显示列表。
It is equivalent to specifying the display: block property.
这等价于指定display：block属性。
Why does display: block interfere with opacity?
为什么显示：块干扰不透明度？
Why does display: block interfere with opacity?
为什么显示：块干扰不透明度？
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