svelte/test/runtime/samples/observe-deferred/main.html

<p ref:a>{{value}}</p>
<p ref:b></p>

<script>
	export default {
		oncreate () {
			this.observe( 'value', () => {
				this.refs.b.textContent = this.refs.a.textContent;
			}, {
				defer: true
			});
		}
	};
</script>