CSS positioned layout

TheCSS positioned layout module defines the coordinate-based positioning and offsetting schemes available in CSS and the properties used to position and stack elements on a web page. The module is best known for defining the basic positioning methods, including relative positioning, sticky positioning, absolute positioning, and fixed positioning. It also defines how positioned elements are painted and layered, clarifying stacking behavior and visual order.

The positioned layout module defines the physical, logical, and shorthandinset properties. The logical properties enable developing with internationalization and responsiveness in mind.

Like all CSS modules, this module impacts and is impacted by other modules. This module describes how positioning interacts with other layout modules such asCSS flexible box layout andCSS Grid layout. Other modules, such asCSS anchor positioning, build upon this module to enable positioning elements relative to other elements and layers.

::backdrop

Glossary terms and definitions

Guides

Understanding z-index: Presents the notion of stacking context and explains how z-ordering works, with several examples.
Stacking without thez-index property: The stacking rules that apply whenz-index is not used.
Stacking floating elements: How floating elements are handled with stacking.
Usingz-index: How to usez-index to change default stacking.
Stacking context: CSS stacking context, the CSS features that create new stacking contexts, and nested stacking contexts.
Learn: positioning: The different position values and how to use them.