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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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 1.0 (1.7 or earlier) 5.0 6.0 1.0 (85)
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 1.0 1.0 (1) (Yes) (Yes) (Yes)

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning