svelte/documentation/tutorial/06-bindings/05-textarea-inputs/app-a/App.svelte

<script>
	import { marked } from 'marked';
	let value = `Some words are *italic*, some are **bold**`;
</script>

{@html marked(value)}

<textarea {value} />

<style>
	textarea {
		width: 100%;
		height: 200px;
	}
</style>