CSS animations enable complex motion sequences using keyframes. Here's how to create engaging animations.
Basic Keyframes
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Animation Properties
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Timing Functions
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Fill Modes
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Direction Options
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Practical Animations
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Loading Spinners
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Attention Seekers
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Entrance Animations
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Exit Animations
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Multiple Animations
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Animation Events (JavaScript)
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Performance Optimization
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Reduced Motion
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Best Practices
Performance:
✓ Animate transform and opacity
✓ Use will-change sparingly
✓ Avoid layout thrashing
✓ Use GPU acceleration
Timing:
✓ Keep durations short (200-500ms)
✓ Use appropriate easing
✓ Stagger multiple elements
✓ Add subtle delays
Accessibility:
✓ Respect prefers-reduced-motion
✓ Don't rely solely on animation
✓ Provide pause controls
✓ Avoid rapid flashing
Avoid:
✗ Animating layout properties
✗ Too many simultaneous animations
✗ Infinite animations without purpose
✗ Motion sickness triggers
Conclusion
CSS animations with keyframes enable rich motion design without JavaScript. Use transform and opacity for best performance, respect user preferences with prefers-reduced-motion, and keep durations short for better UX. Combine multiple animations with delays for sophisticated sequences, and always provide meaningful motion that enhances rather than distracts.