Name the purpose of each effect
An animation may show a state change, connect related elements or direct attention to a next step. Write that purpose down before adding a new effect. If movement only competes with important text or delays access to information, reconsider it. A restrained interaction can communicate more clearly than several simultaneous scroll and hover effects.
Keep content available independently
Important headings, links and controls should not depend on an animation completing. Test the page when JavaScript is unavailable or an animation library fails. Avoid leaving elements permanently transparent until a scroll event runs. The static document should still explain the offer and provide a usable route to the next page or contact method.
Respect user control
Support the device’s reduced-motion preference and provide a way to pause continuous movement where needed. Pausing should restore a usable layout, including content in pinned or horizontally moving sections. Do not remove information from the reduced-motion version. Check that keyboard focus remains visible and that movement does not make a control difficult to target.
Measure the interaction cost
Test on a less powerful device and inspect whether animation creates long tasks or visible stutter. Prefer effects that can run without repeated expensive layout work, and clean up listeners when leaving a page. Review the experience at mobile widths separately. The animation is successful when it supports understanding without making the underlying task slower or harder.
Your practical checklist
- Give each effect a clear purpose
- Keep essential content visible without animation
- Support pause and reduced motion
- Test performance and cleanup across devices
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