z-index
/zed ˈɪndeks/
Definition
A CSS property that controls the stacking order of positioned elements — higher values appear on top.
Example in context
"The modal overlay needs z-index: 1000; the dropdown, z-index: 200 — otherwise the dropdown bleeds through."
Related terms
Practice this term
Master z-index in context by working through exercises in the CSS & Frontend module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.