Layout & CSS Core A2 · Formal specification

CSS Positioning

CSS positioning says what an element is placed against. It may use normal flow, itself, an ancestor, or the viewport as its reference.

See how it works
You might call it relativeabsolute positioning

See how it works

Original worked exampleCSS Positioning

Another example

A badge uses absolute positioning inside an avatar. The avatar wrapper uses relative positioning.

Main parts

  1. 01Outer constraint
  2. 02Content and spacing model
  3. 03Computed size or reflow result

Use it when

Use positioning when an element has a clear item or area to stay anchored to.

Do not use it when

Never use absolute positioning in place of a real responsive layout.

Name used in code

position: relative | absolute

Before you ship

Check content order, shared design values, component consistency, contrast, zoom, and layout changes by screen size. Verify every theme, language, and state. If there is motion, offer an equal reduced-motion experience.

Request you can copy

Outcome: Use or define CSS Positioning to make the visual experience clear and easy to use. User context: A badge uses absolute positioning inside an avatar. The avatar wrapper uses relative positioning. Design concept to apply: CSS Positioning. Why it fits: Use positioning when an element has a clear item or area to stay anchored to. Do not use it when: Never use absolute positioning in place of a real responsive layout. Design requirements: Set the content order, shared design values, and reusable components. Define how the layout changes by screen size and state. Keep useful design choices separate from decoration. Inclusion and resilience: Check contrast, zoom, languages, themes, and reduced motion when needed. Do not use color or effects as the only way to show meaning. Acceptance criteria: The design stays clear on phones and desktops, at zoom, in every theme, and in all supported languages. Interactive states stay clear and consistent. Evidence and limits (evidence boundary): A formal document may still be a draft, release candidate, or final version. Check its status and browser or platform support. Unknowns to confirm: Brand limits, amount of content, supported themes and languages, target devices, and design-system rules.

Check this request

Review the current use of CSS Positioning. Definition: CSS positioning says what an element is placed against. It may use normal flow, itself, an ancestor, or the viewport as its reference. Release checks: Check content order, shared design values, component consistency, contrast, zoom, and layout changes by screen size. Verify every theme, language, and state. If there is motion, offer an equal reduced-motion experience. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.

A2
How official is this term?

Formal specification

A published, versioned formal specification defines this term for the listed technical scope.

A formal document may still be a draft, release candidate, or final version. Check its status and browser or platform support.

Scope
CSS positioning
Document status
draft
Checked on
2026-07-30

Evidence sources & scope

Authority source + Term reference · W3C CSS Working Group · draft CSS Positioned Layout Module Level 3 — Positioning schemes: the position property Positioning schemes: the position property Scope: CSS positioning; direct scope: Positioning schemes: the position property Role here: Direct term reference Source covers: canonical name, definition, semantics, implementation Authority source · W3C CSS Working Group · draft CSS Positioned Layout Module Level 3 Scope: CSS positioning Role here: Authority within stated scope Source covers: canonical name, definition, semantics, implementation

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