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This article mainly introduces the example analysis of the cascading phenomenon in the Css positioning elements, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

Cascading phenomenon of Css location elements

Add positioning to elements, there may be cascading of elements, the order of cascading generally meets the following rules:

Parent-child relationship: child elements are cascaded on top of parent elements.

Not a father-son relationship.

Element type cascading order

All non-positioning elements generally do not exist cascading in the standard flow.

One is a positioning element, and one is a non-positioning element. Positioning elements are cascaded on top of non-positioning elements.

All positioning elements are stacked on top of the previous positioning elements by default. Use the css attribute z-index to control the cascading order

Z-index attribute

The z-index attribute is used to set the cascading order of positioning elements (valid only for positioning elements, not static). Values can be positive integer, negative integer, 0

Comparison rules:

If it is a brotherly relationship: the larger the z-index, the more it is stacked on top, the z-index is equal, and the elements written on the back are stacked on top.

If it is not brotherly relationship: from the element itself and ancestral elements, find the two nearest positioning elements (brotherly relationship) for comparison, and the two positioning elements must have a specific value to set z-index.

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