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Chapter 8. Positioning Controls > Stacking Objects (3-D Positioning)

Stacking Objects (3-D Positioning)

Despite the fact that the screen is a two-dimensional area, elements that are positioned can be given a third dimension: a stacking order in relationship to one another.

Positioned elements are assigned stacking numbers automatically, starting with 0 and continuing incrementally with 1, 2, 3, and so on in the order in which the elements appear in the HTML and relative to their parents and siblings. This system is called the z-index. An element's z-index number is a value that shows its 3-D relation to other elements in the window.


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