CSS animations create engaging experiences with keyframes and animation properties. Here's how to master them.
Basic Keyframes
Animation Properties
Timing Functions
Iteration and Direction
Fill Mode
Play State
Common Animations
Loading Spinners
Entrance Animations
Attention Seekers
Performance
Reduced Motion
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.