HTML

svelte if

{#if x > 10}
	<p>{x} is greater than 10</p>
{:else if 5 > x}
	<p>{x} is less than 5</p>
{:else}
	<p>{x} is between 5 and 10</p>
{/if}

svelte if block

<script>
	let user = { loggedIn: false };
	let toggle = () => user.loggedIn = !user.loggedIn;
</script>

{#if user.loggedIn}
	<button on:click={toggle}>Log out</button>
{/if}

{#if !user.loggedIn}
	<button on:click={toggle}>Log in</button>
{/if}