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You can also declare event handlers inline:

App
<script>
	let m = $state({ x: 0, y: 0 });

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

<div
	onpointermove={(event) => {
		m.x = event.clientX;
		m.y = event.clientY;
	}}
>
	The pointer is at {m.x} x {m.y}
</div>

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