JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>Siti Creati da me:
        <ul>
            <li>
                <a target="_blank" href="http://astropvt.altervista.org/NuovaCartella/index.php">AstroSite</a>
            </li>
            <li>
                <a target="_blank" href="http://astropvt.altervista.org/Quiz.htm">Quizzissimo</a>
            </li>
            <li>Altro:
                
        <ul>
            <li>
                <a target="_blank" href="http://astropvt.altervista.org/NuovaCartella/index.php">Google.it</a>
            </li>
            <li>
                <a target="_blank" href="http://astropvt.altervista.org/Quiz.htm">hwupgrade.it</a>
            </li>
        </ul>
            </li>
        </ul>
    </li>
    <li>Lavori Grafici:
        <ul>
            <li>
                <a target="_blank" href="http://astropvt.altervista.org/Prova_Photoshop.html">Photoshop</a>
            </li>
            <li>
                <a target="_blank" href="http://astropvt.altervista.org/Prova_Illustrator.html">Illustrator</a>
            </li>
        </ul>
    </li>
</ul>

CSS

li ul {
    display: none;
}
ul {
    margin-bottom: 10px;
}
li {
    cursor: pointer;
}

JavaScript

$('li').click(function(e) {
    $(this).find('> ul').slideToggle(150);
    e.stopPropagation();
});