The z-index property sets the stack order of an element. An element with greater stack order is always in front of another element with lower stack order.
z-index属性可以设置元素的堆放次序。有着较大的值的元素会堆叠在较小值元素的上面。

Note: Elements can have negative stack orders.
注意：元素可以使用负数的堆叠次序

Note: Z-index only works on elements that have been positioned (eg position:absolute;)!
注意：Z-index只可以在被定位的元素上使用(比如 position:absolute)

Inherited: No
继承性：无

举例

可用值

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