Use a viewport media query when animation should change with the screen or device; use a container query when a reusable component should respond to the space its own container gives it. In either case, provide a reduced-motion or static option with prefers-reduced-motion, and favor effects such as transform and opacity when they suit the design.
Choose the responsive condition first
Responsive animation is motion that adapts to its context while remaining usable at different viewport sizes, component sizes, and motion preferences. Start by identifying what should trigger the change:
- Viewport or device condition: use a media query. For example, simplify a page-level entrance animation on a narrow screen.
- Component space: use a container query when the same component may appear in wide and narrow regions regardless of the overall viewport.
Media queries can respond to viewport values and browser or device features. Container queries let styles respond to a containing element’s size. MDN describes media queries as a key part of responsive design and container queries as a way for reusable components to adapt to their container. MDN: using media queries; MDN: container queries.
Build a viewport-responsive animation
This example animates a card with opacity and translation on wider viewports, and uses a shorter, smaller movement on narrow ones. The markup remains understandable if the animation does not run.
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<article class="card">
<h2>A responsive card</h2>
<p>The information is available without animation.</p>
</article>.card {
opacity: 0;
transform: translateY(1rem);
animation: card-enter 500ms ease-out forwards;
}
@keyframes card-enter {
to {
opacity: 1;
transform: translateY(0);
}
}
@media (max-width: 40rem) {
.card {
animation-duration: 250ms;
transform: translateY(0.4rem);
}
}The breakpoint is an example, not a universal threshold. Choose it based on where the design or motion stops working well, rather than assuming every device in a category has the same width. If the effect is decorative and not needed to understand or use the card, let the reduced-motion rule below offer a still version.
Use a container query for reusable components
A component can sit in a sidebar on a wide page and become full-width on another page. A viewport breakpoint would not necessarily describe its available space. Mark the component’s parent as a query container, then adapt the component at a container width that fits its layout:
.card-region {
container-type: inline-size;
}
.card {
opacity: 0;
animation: card-enter 500ms ease-out forwards;
}
@container (max-width: 24rem) {
.card {
animation-duration: 250ms;
}
}The query applies based on the container rather than the viewport. Use the container approach only when container size is the real condition; use a viewport media query for page-level or device-feature changes. Check container-query support against the browsers your project targets before relying on it.
Respect reduced-motion preferences
The prefers-reduced-motion media feature can detect when the user or user agent indicates a preference to minimize nonessential movement. It has the values reduce and no-preference. MDN recommends minimizing or removing nonessential movement when the preference is reduced. MDN: prefers-reduced-motion.
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A direct approach is to keep the motion for the default presentation and remove the animation for reduced-motion users:
@media (prefers-reduced-motion: reduce) {
.card {
animation: none;
opacity: 1;
transform: none;
}
}Set the static properties explicitly so the element does not remain at an animation’s initial hidden state when the animation is disabled. Another valid pattern is to make the static state the default and add motion only under (prefers-reduced-motion: no-preference). W3C WAI’s Technique C39 demonstrates these patterns: “The objective of this technique is to allow users to prevent animations (including motion animations) from being displayed on web pages, via the use of the prefers-reduced-motion CSS Media Query.” C39 is an example technique related to WCAG 2.2 Success Criterion 2.3.3, not a mandatory method of conformance. W3C WAI: Technique C39.
Do not remove essential information or functionality with the motion. W3C explains that essential animation is permitted when removing it would fundamentally change information or functionality that cannot be achieved another conforming way. It also distinguishes nonessential animation initiated by user interaction from animation that starts automatically; they are addressed under different WCAG criteria. Movement required to scroll new content into view is part of scrolling, while additional decorative movement is not automatically essential. W3C WAI: Understanding animation from interactions.
Choose properties with rendering costs in mind
Large numbers of animations or unnecessarily elaborate effects can require more processing and degrade performance. Avoid animating properties that require layout or repaint when a suitable alternative works. Changes to dimensions such as width, height, border, and padding, or positional properties such as margin, top, left, and right, can trigger reflow and repaint. For many visual transitions, transform and opacity are better candidates; filter may be appropriate for some effects but should be evaluated for its actual cost.
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- Remove movement that does not help users understand state, hierarchy, or feedback.
- Prefer a short transform or opacity effect over repeatedly changing layout, when the design permits.
- Keep the number and duration of concurrent animations reasonable for the experience.
- Do not add
will-changepreemptively. MDN advises treating it as a last resort for a demonstrated performance problem.
These choices are practical guidance, not a guarantee that every animation will run smoothly on every device. Test the actual effect in the target browser and device range. MDN’s animation guidance discusses both performance costs and the Web Animations API’s connection to CSS animations. MDN: CSS and JavaScript animation performance.
Decide whether CSS or JavaScript should control the motion
CSS is a natural fit for declarative effects tied to styles, states, media queries, or container queries. JavaScript and the Web Animations API are useful when code needs to start, pause, reverse, sequence, or otherwise programmatically control an animation. These are implementation choices, not a rule that CSS is always better: use the simplest mechanism that gives the required control, and keep the reduced-motion presentation available in either approach. For essential DOM animations, MDN recommends CSS where possible rather than JavaScript, while noting that the Web Animations API can connect JavaScript to CSS animations. MDN: animation performance.
Test responsive and reduced-motion states
- Check the page at the narrow and wide widths your design supports, plus the component widths that can occur in its actual layouts.
- Confirm the animated element is still visible and usable if its animation is disabled or does not run.
- Enable reduced motion in the operating system or browser environment, then reload or revisit the page and verify the reduced or static state.
- Test interactions that trigger animation separately from motion that starts automatically. Confirm that removing nonessential movement does not hide a state change or remove functionality.
- Inspect performance in your target browsers and devices, especially if the page animates many elements or changes layout-related properties.
- Verify newer CSS features against the project’s browser support matrix; do not assume one compatibility result applies to every browser or animation API.
Troubleshoot common problems
The element disappears when reduced motion is enabled
If the default style sets opacity: 0 or another hidden initial state, disabling the animation can leave that state in place. Set the visible static values inside the reduced-motion block, such as opacity: 1 and transform: none.
A component responds at the wrong screen width
A viewport query only observes viewport and device conditions. If the component is narrow inside a wide page, use a container query and ensure the relevant ancestor establishes a query container.
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The animation causes visible jank
Reduce unnecessary concurrent effects and inspect which properties are changing. If the animation alters dimensions or layout positions, try a suitable transform or opacity treatment; measure in the target environment rather than assuming a property is cost-free.
The reduced-motion rule appears not to apply
Check the exact media feature spelling and whether the browser or operating system is set to reduce motion. Also inspect cascade order and specificity to ensure a later style is not overriding the reduced state.
A newer CSS feature does not work consistently
Confirm support for the specific feature in every browser in your project’s target matrix. Provide a usable baseline state that does not depend on the enhancement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Or skip the browser setup
If you need screenshots to inspect how a page looks at different responsive states, ScreenshotNeo can return a screenshot or PDF from one GET request. This is separate from testing reduced-motion behavior: set up and verify the motion preference in your own browser or test environment.
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Frequently asked questions
Does every animation need to be removed for reduced-motion users?
No. Reduce or remove nonessential movement while preserving essential information and functionality. The appropriate result may be a static state or a less intense effect.
Are container queries a replacement for media queries?
No. They answer different questions: media queries respond to viewport or device conditions, while container queries respond to a containing element’s size.
Is will-change a standard fix for animation performance?
No. Use it only as a last resort for a performance issue you have identified, not as a default animation declaration.
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