svelte/documentation/tutorial/04-logic/02-else-blocks/text.md

title
Else blocks

Since the two conditions — if user.loggedIn and if !user.loggedIn — are mutually exclusive, we can simplify this component slightly by using an else block:

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

A # character always indicates a block opening tag. A / character always indicates a block closing tag. A : character, as in {:else}, indicates a block continuation tag. Don't worry — you've already learned almost all the syntax Svelte adds to HTML.