Fixed Position
CSS fixed positioning places a box relative to a fixed container, usually the browser window. The box normally stays in place while the document scrolls.
Another example
A dismissible emergency control stays inside the safe area of a phone screen. It remains reachable while scrolling without covering focused content or the on-screen keyboard. A transformed parent can change which box it is fixed to.
Main parts
- 01fixed containing block
- 02viewport inset
- 03overlap management
Use it when
Use this term sparingly for window-level controls or surfaces that truly must stay in one place.
Do not use it when
Do not use fixed UI that hides content, makes areas unreachable, or should move with its section.
Name used in code
position: fixed; inset: … 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.
Outcome: Use or define Fixed Position to make the visual experience clear and easy to use. User context: A dismissible emergency control stays inside the safe area of a phone screen. It remains reachable while scrolling without covering focused content or the on-screen keyboard. A transformed parent can change which box it is fixed to. Design concept to apply: Fixed Position. Why it fits: Use this term sparingly for window-level controls or surfaces that truly must stay in one place. Do not use it when: Do not use fixed UI that hides content, makes areas unreachable, or should move with its section. 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 Fixed Position. Definition: CSS fixed positioning places a box relative to a fixed container, usually the browser window. The box normally stays in place while the document scrolls. 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.