Animation should communicate something: a state change, a spatial relationship, a moment of delight. Purposeless movement is worse than no movement at all.
Animation on a website should answer the question "what does this movement tell the visitor?" A button that subtly lifts on hover communicates "this is interactive." A section that fades into view as you scroll communicates "here is new content." A loading spinner communicates "something is happening." If an animation does not communicate anything, it is visual noise.
Heavy things should move slowly. Light things should move quickly. Nothing should move in a perfectly straight line. These are the rules of natural physics that make animation feel organic rather than mechanical. When motion feels wrong, visitors cannot articulate why, but they feel uneasy.
Only one thing should animate at a time. When five elements bounce, slide, and fade simultaneously, none of them communicate anything. The visitor's eye has nowhere to land. Stagger your animations so each element gets a moment of attention before the next one enters.
Always respect the prefers-reduced-motion setting. Some visitors experience motion sickness or seizures from screen animation. When this setting is active, all animation should stop completely. The content must be fully visible and functional without any movement.
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Frequently asked
When does website animation actually help?
Animation helps when the movement communicates something to the visitor. A button that subtly lifts on hover communicates that it is interactive, a section that fades into view as you scroll communicates that new content has arrived, and a loading spinner communicates that something is happening. If an animation does not communicate anything, it is visual noise.
What makes animation feel natural instead of mechanical?
Follow the rules of natural physics: heavy things should move slowly, light things should move quickly, and nothing should move in a perfectly straight line. When motion feels wrong, visitors cannot articulate why, but they feel uneasy.
How many things should animate at once?
Only one thing should animate at a time. When five elements bounce, slide, and fade simultaneously, none of them communicate anything and the visitor's eye has nowhere to land. Stagger your animations so each element gets a moment of attention before the next one enters.
What about visitors who are sensitive to motion?
Always respect the prefers-reduced-motion setting. Some visitors experience motion sickness or seizures from screen animation, so when this setting is active all animation should stop completely. The content must be fully visible and functional without any movement.
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