CSS Animation Recipes

Ready-to-use CSS for `` props. Copy into your global stylesheet.

---

Timing Variables

:root {
  --duration-exit: 150ms;
  --duration-enter: 210ms;
  --duration-move: 400ms;
}

Shared Keyframes

@keyframes fade {
  from { filter: blur(3px); opacity: 0; }
  to { filter: blur(0); opacity: 1; }
}

@keyframes slide {
  from { translate: var(--slide-offset); }
  to { translate: 0; }
}

@keyframes slide-y {
  from { transform: translateY(var(--slide-y-offset, 10px)); }
  to { transform: translateY(0); }
}

---

Fade

::view-transition-old(.fade-out) {
  animation: var(--duration-exit) ease-in fade reverse;
}
::view-transition-new(.fade-in) {
  animation: var(--duration-enter) ease-out var(--duration-exit) both fade;
}

Usage: ``

---

Slide (Vertical)

::view-transition-old(.slide-down) {
  animation:
    var(--duration-exit) ease-out both fade reverse,
    var(--duration-exit) ease-out both slide-y reverse;
}
::view-transition-new(.slide-up) {
  animation:
    var(--duration-enter) ease-in var(--duration-exit) both fade,
    var(--duration-move) ease-in both slide-y;
}

Usage:

}>
  

---

Directional Navigation

Separate Enter/Exit Classes

::view-transition-new(.slide-from-right) {
  --slide-offset: 60px;
  animation:
    var(--duration-enter) ease-out var(--duration-exit) both fade,
    var(--duration-move) ease-in-out both slide;
}
::view-transition-old(.slide-to-left) {
  --slide-offset: -60px;
  animation:
    var(--duration-exit) ease-in both fade reverse,
    var(--duration-move) ease-in-out both slide reverse;
}

::view-transition-new(.slide-from-left) {
  --slide-offset: -60px;
  animation:
    var(--duration-enter) ease-out var(--duration-exit) both fade,
    var(--duration-move) ease-in-out both slide;
}
::view-transition-old(.slide-to-right) {
  --slide-offset: 60px;
  animation:
    var(--duration-exit) ease-in both fade reverse,
    var(--duration-move) ease-in-out both slide reverse;
}

Single-Class Approach

::view-transition-old(.nav-forward) {
  --slide-offset: -60px;
  animation:
    var(--duration-exit) ease-in both fade reverse,
    var(--duration-move) ease-in-out both slide reverse;
}
::view-transition-new(.nav-forward) {
  --slide-offset: 60px;
  animation:
    var(--duration-enter) ease-out var(--duration-exit) both fade,
    var(--duration-move) ease-in-out both slide;
}

::view-transition-old(.nav-back) {
  --slide-offset: 60px;
  animation:
    var(--duration-exit) ease-in both fade reverse,
    var(--duration-move) ease-in-out both slide reverse;
}
::view-transition-new(.nav-back) {
  --slide-offset: -60px;
  animation:
    var(--duration-enter) ease-out var(--duration-exit) both fade,
    var(--duration-move) ease-in-out both slide;
}

Triggering programmatically:

startTransition(() => {
  addTransitionType('nav-forward');
  router.push('/next-page');
});

---

Shared Element Morph

::view-transition-group(.morph) {
  animation-duration: var(--duration-move);
}

::view-transition-image-pair(.morph) {
  animation-name: via-blur;
}

@keyframes via-blur {
  30% { filter: blur(3px); }
}

Usage: ``

---

Scale

::view-transition-old(.scale-out) {
  animation: var(--duration-exit) ease-in scale-down;
}
::view-transition-new(.scale-in) {
  animation: var(--duration-enter) ease-out var(--duration-exit) both scale-up;
}

@keyframes scale-down {
  from { transform: scale(1); opacity: 1; }
  to { transform: scale(0.85); opacity: 0; }
}
@keyframes scale-up {
  from { transform: scale(0.85); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

Usage: ``

---

Persistent Element Isolation

::view-transition-group(persistent-nav) {
  animation: none;
  z-index: 100;
}

Backdrop-Blur Workaround

For elements with backdrop-filter, hide the old snapshot to avoid flash:

::view-transition-old(persistent-nav) {
  display: none;
}
::view-transition-new(persistent-nav) {
  animation: none;
}

---

Reduced Motion

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(*),
  ::view-transition-new(*),
  ::view-transition-group(*) {
    animation-duration: 0s !important;
    animation-delay: 0s !important;
  }
}