Kepiye CSS transitions nganti bisa ditindakake?

Question

Accepted Answer

A **transition** ngalusake animasi properti saka nilai lawase menyang nilai anyar sajrone wektu, tinimbang ngganti langsung. Sampeyan ndeklarasi *apa* sing bakal dianimasèke lan *nganti seberapa lange*, banjur aktifake kanthi ngganti properti kasebut (asring nganggo `:hover` utawa kelas).

```css
.button {
  background: blue;
  transition: background 0.3s ease;  /* animate background over 300ms */
}
.button:hover {
  background: darkblue;  /* on hover, it fades smoothly instead of snapping */
}
```

## Papat bagian saka shorthand

```css
transition: background 0.3s ease 0s;
/*          │          │    │    └── delay before starting */
/*          │          │    └─────── timing function (the easing curve) */
/*          │          └──────────── duration */
/*          └─────────────────────── property to animate (or `all`) */
```

## Animasi pirang-pirang properti

```css
.card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-4px);          /* lifts up */
  box-shadow: 0 8px 20px rgba(0,0,0,0.2); /* + deeper shadow */
}
```

Cathet saben properti (dipisahake kothak) kajenengané nganggo `all`, sing bisa sengaja nganimasèke barang sing ora dimaksud lan mbebayani performa.

## Timing functions

```css
transition-timing-function: ease;        /* slow-fast-slow (default) */
/* linear | ease-in | ease-out | ease-in-out */
transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); /* custom curve */
```

## Performa: animate transform/opacity

```css
/* ✅ cheap — GPU-composited, no layout recalculation */
transition: transform 0.3s, opacity 0.3s;
/* ❌ expensive — animating width/top/left triggers layout on every frame */
transition: width 0.3s, left 0.3s;
```

Lebih suka animasi `transform` lan `opacity`; padha ditangani dening compositor tanpa njalanake layout manèh, mula padha tetep lembut (60fps).

## Aksesibilitas

```css
@media (prefers-reduced-motion: reduce) {
  * { transition: none; } /* respect users who get motion sickness */
}
```

## Kenapa iki dadi penting

Transitions nambah kilauan sing ndadekake UI krasa responsif lan urip (efek hover, perubahan kahanan lembut) mung kanthi siji baris.

Nguninga yen kudu animasi `transform`/`opacity` kanggo performa — lan minangka hormat `prefers-reduced-motion` — punika sing mbedakake gerakan lembut sing accessible saka animasi sing putus-putus.