JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">


<ul id="menu">
<li class="ui-state-disabled">Aberdeen</li>
<li>Ada</li>
<li>Adamsville</li>
<li>Addyston</li>
<li>Delphi
<ul class="external_block">
<li class="ui-state-disabled">Ada</li>
<li>Saarland</li>
<li>Salzburg an der schönen Donau</li>
</ul>
</li>
<li>Saarland</li>
<li>Salzburg<ul>
<li>Delphi
<ul>
<li>Ada</li>
<li>Saarland</li>
<li>Salzburg</li>
</ul>
</li>
<li>Delphi
<ul>
<li>Ada</li>
<li>Saarland</li>
<li>Salzburg</li>
</ul>
</li>
<li>Perch</li>
</ul>
</li>
<li class="ui-state-disabled">Amesville</li>
</ul>

CSS

.ui-menu { width: 150px; }
.ui-menu-item { white-space: nowrap; }
.ui-menu .external_block { width: 300px; }

JavaScript

$(function() {
$( "#menu" ).menu();
});