# will-change

Warns the browser a property is about to animate.

## What does `will-change` do?

`will-change` warns the browser that a property is about to animate, so it can prepare. Use it sparingly: every hint costs memory.

```css
.slide-panel { will-change: transform; }
```

Level: Master · [More CSS terms at this level](https://www.ask-codey.com/glossary/subjects/css/master)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/will-change