1. dialog
<div class="app">
<dialog open>
<p>Greetings, one and all!</p>
<form method="dialog">
<button>OK</button>
</form>
</dialog>
</div>
<div class="app">
<dialog open>
<p>Greetings, one and all!</p>
<form method="dialog">
<button>OK</button>
</form>
</dialog>
</div>