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Z is for Z-Index

The Z-index is a parameter in CSS positioning - strictly speaking its a property of an element. It allows you to stack elements the way you stack layers in a graphics programme such as Photoshop, or The Gimp, or Paint Shop Pro. The index is the bit that sets the order of the elements when they are stacked one on top of the other. The lowest number which can include negative numbers has the lowest priority, that is, is at the bottom of the stack.

The name obviously derives from the third axis (z) in 3-dimensional representational systems.

 

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