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You can also declare event handlers inline:

App.svelte
<script>
	let m = { x: 0, y: 0 };

	function handleMove(event) {
		m.x = event.clientX;
		m.y = event.clientY;
	}
</script>

<div
	on:pointermove={(e) => {
		m = { x: e.clientX, y: e.clientY };
	}}
>
	The pointer is at {m.x} x {m.y}
</div>

In some frameworks you may see recommendations to avoid inline event handlers for performance reasons, particularly inside loops. That advice doesn't apply to Svelte — the compiler will always do the right thing, whichever form you choose.

Next: Event modifiers

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<script>
	let m = { x: 0, y: 0 };
 
	function handleMove(event) {
		m.x = event.clientX;
		m.y = event.clientY;
	}
</script>
 
<div on:pointermove={handleMove}>
	The pointer is at {m.x} x {m.y}
</div>
 
<style>
	div {
		position: fixed;
		left: 0;
		top: 0;
		width: 100%;
		height: 100%;
		padding: 1rem;
	}
</style>
 
initialising