CSS Logical Properties
CSS logical properties describe sides by writing flow, such as block and inline. They replace fixed directions like top, right, bottom, and left. This helps layouts follow the language's writing direction.
Another example
A checkout uses `margin-inline-start` for space beside an icon and `border-inline-end` for a divider. The same rules place them on the intended sides in English, Arabic RTL, and vertical Japanese, without per-language overrides.
Main parts
- 01Writing mode
- 02Block axis
- 03Inline axis
Use it when
Prefer logical spacing, sizes, borders, and positions for components that work in more than one writing direction.
Do not use it when
Use top, right, bottom, or left only when the exact physical side is the real need. Text flow should not change that need.
Name used in code
margin-inline, padding-block, inline-size, inset-inline, border-block 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 CSS Logical Properties to make the visual experience clear and easy to use. User context: A checkout uses `margin-inline-start` for space beside an icon and `border-inline-end` for a divider. The same rules place them on the intended sides in English, Arabic RTL, and vertical Japanese, without per-language overrides. Design concept to apply: CSS Logical Properties. Why it fits: Prefer logical spacing, sizes, borders, and positions for components that work in more than one writing direction. Do not use it when: Use top, right, bottom, or left only when the exact physical side is the real need. Text flow should not change that need. 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 Logical Properties. Definition: CSS logical properties describe sides by writing flow, such as block and inline. They replace fixed directions like top, right, bottom, and left. This helps layouts follow the language's writing direction. 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.