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CSS Positioning

CSS Positioned Layout is a module of CSS that defines how to position elements on the page.

Reference

CSS properties

Guides

Understanding CSS z-index
Presents the notion of stacking context and explains how z-ordering works, with several examples.

Specifications

Specification Status Comment
CSS Positioned Layout Module Level 3 Working Draft
CSS Level 2 (Revision 1) Recommendation

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https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning