<body>
    <div id="root"></div>

    <!-- JS goes here -->
    <script>
        const rootElt = document.getElementById('root');
        const childElt = document.createElement('div');
        childElt.textContent = 'Hello World';
        childElt.className = 'container';
        rootElt.appendChild(childElt);
    </script>
</body>
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External JavaScript

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