<script> let yes = false; </script> <label> <input type="checkbox" bind:checked={yes} /> Yes! Send me regular email spam </label> {#if yes} <p>Thank you. We will bombard your inbox and sell your personal details.</p> {:else} <p>You must opt-in to continue. If you're not paying, you're the product.</p> {/if} <button disabled={!yes}> Subscribe </button>