Breakpoint & Media Query
A breakpoint is where a layout needs to change. A media query applies CSS when the viewport or device meets a stated condition.
Another example
Cards change from three columns to one when their content no longer fits. The change isn't based on a guessed phone model.
Main parts
- 01Outer constraint
- 02Content and spacing model
- 03Computed size or reflow result
Use it when
Choose breakpoints from the space your content needs, then select the matching media features.
Do not use it when
Never build a list of breakpoints for specific device models. That list becomes old quickly.
Name used in code
@media 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 Breakpoint & Media Query to make the visual experience clear and easy to use. User context: Cards change from three columns to one when their content no longer fits. The change isn't based on a guessed phone model. Design concept to apply: Breakpoint & Media Query. Why it fits: Choose breakpoints from the space your content needs, then select the matching media features. Do not use it when: Never build a list of breakpoints for specific device models. That list becomes old quickly. 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): No single official standard controls the whole term. Its meaning may change across teams, platforms, or frameworks. 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 Breakpoint & Media Query. Definition: A breakpoint is where a layout needs to change. A media query applies CSS when the viewport or device meets a stated condition. 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.