What is z-order?

John Zukowski

To understand z-order, think first of x and y positioning. The x-y coordinate space places position (0, 0) at the top-left corner of the screen. Increasing the x value moves the position to the right. Increasing the y value moves the position down. Where does that leave position z? Z-order controls how components are drawn on top of one another. The 0 layer is the highest layer, or the one drawn last. Layer 1 is next, then 2, and so on.

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