Piye carane CSS keyframe animations bisa bisa?

Question

Accepted Answer

Nalika transisi nganimasi *antarane rong negara*, **animasi `@keyframes`** nuduhake siji urutan multi-step sing bisa mlaku sacara otomatis, bisa loop, lan bisa mlaku lumabar akeh negara perantara.

## Nggawe lan nerapake animasi

```css
@keyframes slide-in {
  from { transform: translateX(-100%); opacity: 0; } /* 0% */
  to   { transform: translateX(0);     opacity: 1; } /* 100% */
}

.panel {
  animation: slide-in 0.5s ease-out;
}
```

## Keyframes multi-step nganggo persentase

```css
@keyframes bounce {
  0%   { transform: translateY(0); }
  50%  { transform: translateY(-30px); } /* peak of the bounce */
  100% { transform: translateY(0); }
}
```

Persentase ndadakke kowe bisa ngatur langkah-langkah akeh ing siji animasi — ora bisa dilakoni karo transisi sederhana.

## Stenografi animasi lengkap

```css
.spinner {
  animation: spin 1s linear infinite;
  /*         │    │    │      └── iteration-count (infinite = loop forever) */
  /*         │    │    └───────── timing function */
  /*         │    └────────────── duration */
  /*         └─────────────────── @keyframes name */
}
@keyframes spin { to { transform: rotate(360deg); } } /* classic loading spinner */
```

Properti liyane: `animation-delay`, `animation-direction: alternate` (bolak-balik), `animation-fill-mode: forwards` (tetep ing negara akhir), `animation-play-state: paused`.

## Performa — animate transform/opacity mung

```css
/* ✅ GPU-composited, 60fps */
@keyframes good { to { transform: scale(1.1); opacity: 0.5; } }
/* ❌ animating width/height/top forces layout every frame → jank */
@keyframes bad  { to { width: 300px; top: 50px; } }
```

Animasi keyframe mlaku ing saben frame, mula nganimasi properti sing micu layout luwih larang tinimbang nganimasi `transform`/`opacity`.

## Aksesibilitas

```css
@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; } /* honor users sensitive to motion */
}
```

## Apa Pentinge

Animasi keyframe dadi tenaga kanggo loaders, clue perhatian, entri, lan efek looping sing transisi ora bisa nyatakake (multi-step, auto-running, infinite).

Mangerteni stenografi, tetep karo `transform`/`opacity` kanggo kalusan, lan ngormati `prefers-reduced-motion` ndadakke kowe bisa mbangun gerak lantip sing tetep peforma lan accessible.