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Index

This page lists all MDN JavaScript pages along with their summary and tags.
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Understanding CSS z-index

Usually HTML pages can be considered two-dimensional, because text, images and other elements are arranged on the page without overlapping. There is a single rendering flow, and all elements are aware of the space taken by others. The z-index attribute lets you adjust the order of the layering of objects when rendering content.
Advanced CSS Guide Understanding_CSS_z-index Web

The stacking context

Stacking context is the three-dimensional conceptualization of HTML elements along an imaginary z-axis relative to the user who is assumed to be facing the viewport or the webpage. HTML elements occupy this space in priority order based on element attributes.
Advanced CSS Example Guide Understanding_CSS_z-index Web