JSFiddle - React, Tailwind, and code Playground

HTML

Input box:
<div class="input" contenteditable>I only want to support a few options (e.g., bold, italic, or font color) here. But try copying and pasting text below...</div>

<p>Try copying and pasting this:
<ul>
    <li>This is a <span style="font-size: 28px;">list</span></li>
    <li>With<sub>fancy</sub><sup>formatting</sup></li>
</ul>

CSS

.input {
    background-color: #EEE;
    border: solid 1px #000;
    width: 20em;
    height: 8em;
    padding: 10px;
}