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Transition functions can accept parameters. Replace the fade transition with fly...

App.svelte
<script>
	import { fly } from 'svelte/transition';
	let visible = true;
</script>

...and apply it to the <p> along with some options:

App.svelte
<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.

Next: In and out

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<script>
	import { fade } from 'svelte/transition';
	let visible = true;
</script>
 
<label>
	<input type="checkbox" bind:checked={visible} />
	visible
</label>
 
{#if visible}
	<p transition:fade>
		Fades in and out
	</p>
{/if}
initialising