svelte/test/runtime/samples/animation-css/main.html

<script>
	export let things;

	function flip(node, animation, params) {
		const dx = animation.from.left - animation.to.left;
		const dy = animation.from.top - animation.to.top;

		return {
			duration: 100,
			css: (t, u) => `transform: translate(${u + dx}px, ${u * dy}px)`
		};
	}
</script>

{#each things as thing (thing.id)}
	<div animate:flip>{thing.name}</div>
{/each}