workpage,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<link href="https://itchief.ru/examples/libs/toast/toast.min.css" rel="stylesheet">
<script src="https://itchief.ru/examples/libs/toast/toast.min.js"></script>
</head>
<body>
<script>
let toast = new Toast({
title: 'Заголовок',
text: 'Сообщение...',
theme: 'dark'
});
window.setTimeout(() => toast._hide(), 3000)
window.setTimeout(() => toast._show(), 7000)
</script>
</body>
</html>