JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <ul>
        <li><a href="#">(VALID)</a></li>
        <li><a href="#">(VALID)</a>
            <ul>
                <li>link1</li>
                <li>link2</li>
            </ul>
        </li>
        <li><a href="#">(I'M NOT SURE)</a>
            <ul>
                <li>
                    <ul>
                        <li>any contents here</li>
                        <li>any contents here</li>
                    </ul>  
                    <ul>
                        <li>any contents here</li>
                        <li>any contents here</li>
                    </ul>
                    <ul>
                        <li>any contents here</li>
                        <li>any contents here</li>
                    </ul>
                </li>
            </ul>
        </li>
    </ul>
</nav>