## Function bindings

You can also use `bind:property={get, set}`, where `get` and `set` are functions, allowing you to perform validation and transformation:

```svelte
<input bind:value={() => value, (v) => (value = v.toLowerCase())} />
```

In the case of readonly bindings like [dimension bindings](#Dimensions), the `get` value should be `null`:

```svelte
<div bind:clientWidth={null, redraw} bind:clientHeight={null, redraw}>...</div>
```

> [!NOTE]
> Function bindings are available in Svelte 5.9.0 and newer.