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---
title: Adding parameters
---
Transition functions can accept parameters. Replace the `fade` transition with `fly`...
```html
<script>
import { fly } from 'svelte/transition';
let visible = true;
</script>
```
...and apply it to the `<p>` along with some options:
```html
<p transition:fly="{{ y: 200, duration: 2000 }}">
Flies in and out
</p>
```
Note that the transition is *reversible* — if you toggle the checkbox while the transition is ongoing, it transitions from the current point, rather than the beginning or the end.