JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="cs" dir="ltr">
<head>
<meta charset="UTF-8">
<title>Titulek stránky</title>
    <script type="text/javascript">
        alert("Vítej!");
    </script>
</head>
<body>
Obsah
</body>
</html>