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HTML 

              
                <body>
	<main>
		<h1>Использование диалоговых окон с помощью html-элемента &lt;dialog&gt;</h1>
		<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam magni nostrum, dolore non ducimus aliquam possimus officiis quisquam recusandae molestiae iusto rerum libero et, earum laborum, eius provident cumque atque?</p>
		<p>Voluptates, voluptate quas nulla quisquam maxime error possimus fugit beatae placeat doloribus odit, sequi numquam expedita ut totam earum officia corrupti iste adipisci harum? Distinctio accusantium quam nisi et. Laborum.</p>
	</main>
	<dialog id="dialog1" open>
			<h2>Диалоговое окно №1</h2>
			<p>Атрибут open позволяет сразу отобразить окно, но без заднего фона.</p>
		<button id="closeDialog1">Закрыть окно</button>
	</dialog>

	<dialog id="dialog2">
			<h2>Модальное окно №2</h2>
			<p>Это окно с помощью элемента	   <code>dialog</code> открывается с задним фоном.</p>
		<p>Нажмите клавишу ESC для скрытия окна или кликните в любом месте.</p>
	</dialog>
	<button>Открыть dialog 1</button>
	<button>Открыть dialog 2</button>
	
</body>
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CSS 

              
                :root {
  --blue: #08a7d8;
  --dark-blue: #0e678c;
}
* {
	box-sizing: border-box;
}
body {
  height: 97vh;
  text-align: center;
  background-color: var(--blue);
	margin: 40px 20px;
}
button {
	display: inline-block;
	margin: 30px 15px 0;
  padding: 15px 35px;
  cursor: pointer;
  border-radius: 30px;
  background: #fff;
  font-size: 20px;
  border: 2px solid var(--dark-blue);
  color: var(--dark-blue);
	box-shadow: 0 8px 8px rgba(6,84,112,.58);
  letter-spacing: 1px;
  line-height: 1;
  transition: background 300ms ease, color 300ms ease;
}
button:hover {
  background: var(--dark-blue);
  color: #fff;
}
main {
	max-width: 700px;
	margin: auto;
}
h1, h2 {
  font-size: 1.5em;
  font-weight: 500;
  margin-top: 0;
}

p {
  margin-bottom: 0;
	line-height: 1.5;
}
dialog {
	max-width: 50%;
  padding: 35px;
  border-radius: 5px;
  border: 0;
}
dialog::backdrop  {
 background: conic-gradient(rgba(128,128, 128, .5), rgba(255, 255,255,.7), var(--dark-blue), black);
}
dialog[open], dialog::backdrop {
  animation: show 500ms ease;
}
@keyframes show {
  0% {
    opacity: 0;
  }
}
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JS 

              
                let [main, dialog1, dialog2, button1, button2] = document.body.children;

button1.addEventListener('click', () => dialog1.show());

button2.addEventListener('click', () => dialog2.showModal());

document.body.addEventListener('click', ({target}) =>   target === dialog2 && target.close());

closeDialog1.addEventListener('click', event => dialog1.close() )
!
999px

Console