- A three-dimensional conceptualization of HTML elements along an imaginary z-axis relative to the user, who is assumed to be facing the viewport or web page. For CSS, each box belongs to one stacking context. The
z-index property establishes whether a box establishes a stacking context, and the level of a box in its stacking context. ← MDN Web Docs
- Related terms: Stack level, Application context, Box, Block container box
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