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CSSAnimationsKeyframesDesign

CSS Animations Guide

Master CSS animations with keyframes for engaging user experiences.

B
Bootspring Team
Engineering
August 8, 2018
7 min read

CSS animations create engaging experiences with keyframes and animation properties. Here's how to master them.

Basic Keyframes

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Animation Properties

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Timing Functions

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Iteration and Direction

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Fill Mode

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Play State

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Common Animations

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Loading Spinners

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Entrance Animations

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Attention Seekers

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Performance

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Reduced Motion

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Best Practices

Performance: ✓ Animate transform and opacity ✓ Use will-change sparingly ✓ Keep animations short (< 500ms for UI) ✓ Test on low-end devices Accessibility: ✓ Respect prefers-reduced-motion ✓ Avoid flashing content ✓ Don't animate essential content ✓ Provide static alternatives UX: ✓ Use animation purposefully ✓ Keep animations subtle ✓ Match animation to content ✓ Consider mobile users Avoid: ✗ Animating layout properties ✗ Too many simultaneous animations ✗ Infinite animations without purpose ✗ Blocking user interaction

Conclusion

CSS animations bring interfaces to life with keyframes and animation properties. Use GPU-accelerated properties (transform, opacity) for smooth performance. Respect user preferences with prefers-reduced-motion. Keep animations purposeful and subtle - they should enhance, not distract from, the user experience. Master timing functions for natural-feeling motion and use fill-mode to control animation state.

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