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$ curl repovive.com/roadmaps/frontend-system-design-interview-prep/modal-system-design/animation-patterns

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$ curl repovive.com/roadmaps/frontend-system-design-interview-prep/modal-system-design/animation-patterns

Repovive

Animation Patterns - Modal System Design | Frontend System Design Interview Prep | Repovive

Repovive.

Frontend System Design Interview Prep17 sections · 206 units12h total

Open in Course

Animation Patterns

Smooth open and close

Animations improve perceived quality.

Common patterns:

Fade in backdrop
Scale up modal content
Slide in from direction

CSS approach:

.modal-enter { opacity: 0; transform: scale(0.95); }
.modal-enter-active { opacity: 1; transform: scale(1); transition: all 200ms; }
.modal-exit { opacity: 1; }
.modal-exit-active { opacity: 0; transition: opacity 150ms; }

Exit animation challenge: Don't unmount until animation completes.

Reduced motion: Respect prefers-reduced-motion. Disable or simplify animations.