Layout & CSS Core A2 · Formal specification

Margin

Margin is the space outside an element’s border. It keeps that element away from nearby layout items.

See how it works
You might call it outer spacing

See how it works

Original worked exampleMargin

Another example

A section gets a top margin so it doesn't look stuck to the section above it.

Main parts

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

Use it when

Use margin outside one item when a parent gap can't explain the rule as clearly.

Do not use it when

Watch for margin collapse. Never add random margins to the edges of reusable components.

Name used in code

margin

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 Margin to make the visual experience clear and easy to use. User context: A section gets a top margin so it doesn't look stuck to the section above it. Design concept to apply: Margin. Why it fits: Use margin outside one item when a parent gap can't explain the rule as clearly. Do not use it when: Watch for margin collapse. Never add random margins to the edges of reusable components. 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 Margin. Definition: Margin is the space outside an element’s border. It keeps that element away from nearby layout items. 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 box model
Document status
draft
Checked on
2026-07-30

Evidence sources & scope

Authority source + Term reference · W3C CSS Working Group · draft CSS Box Model Module Level 4 — Margins Margins Scope: CSS box model; direct scope: Margins Role here: Direct term reference Source covers: canonical name, definition, semantics, implementation Authority source · W3C CSS Working Group · draft CSS Box Model Module Level 4 Scope: CSS box model Role here: Authority within stated scope Source covers: canonical name, definition, semantics, implementation

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