JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgit.com/Semantic-Org/Semantic-UI/next/dist/semantic.js"></script>
<link rel="stylesheet" href="https://rawgit.com/Semantic-Org/Semantic-UI/next/dist/semantic.css">
<h2 class="ui dividing header">ERROR dropdown("setup menu")</h2>

<select id="dropdownSimple">
  <option value="1">one</option>
  <option value="2">two</option>
  <option value="3">three</option>
</select>
<hr>
<select id="dropdownMulti" multiple>
  <option value="1">one</option>
  <option value="2">two</option>
  <option value="3">three</option>
</select>

CSS

body {
    padding: 1em;
}

JavaScript

$("#dropdownSimple").dropdown("setup menu");
$("#dropdownMulti").dropdown("setup menu");

// see Console