svelte/site/content/examples/04-events/01-inline-handlers/App.svelte

<script>
	let m = { x: 0, y: 0 };
</script>

<style>
	div { width: 100%; height: 100%; }
</style>

<div on:mousemove="{e => m = { x: e.clientX, y: e.clientY }}">
	The mouse position is {m.x} x {m.y}
</div>