JSFiddle - React, Tailwind, and code Playground

HTML

<a>Name: a</a> <br />
<abbr>Name: abbr</abbr> <br />
<address>Name: address</address> <br />
<area>Name: area</area> <br />
<article>Name: article</article> <br />
<aside>Name: aside</aside> <br />
<audio>Name: audio</audio> <br />
<b>Name: b</b> <br />
<base>Name: base</base> <br />
<bdo>Name: bdo</bdo> <br />
<blockquote>Name: blockquote</blockquote> <br />
<body>Name: body</body> <br />
<br>Name: br</br> <br />
<button>Name: button</button> <br />
<canvas>Name: canvas</canvas> <br />
<caption>Name: caption</caption> <br />
<cite>Name: cite</cite> <br />
<code>Name: code</code> <br />
<col>Name: col</col> <br />
<colgroup>Name: colgroup</colgroup> <br />
<command>Name: command</command> <br />
<datalist>Name: datalist</datalist> <br />
<dd>Name: dd</dd> <br />
<del>Name: del</del> <br />
<details>Name: details</details> <br />
<dfn>Name: dfn</dfn> <br />
<div>Name: div</div> <br />
<dl>Name: dl</dl> <br />
<dt>Name: dt</dt> <br />
<em>Name: em</em> <br />
<embed>Name: embed</embed> <br />
<eventsource>Name: eventsource</eventsource> <br />
<fieldset>Name: fieldset</fieldset> <br />
<figcaption>Name: figcaption</figcaption> <br />
<figure>Name: figure</figure> <br />
<footer>Name: footer</footer> <br />
<form>Name: form</form> <br />
<h1>Name: h1</h1> <br />
<h2>Name: h2</h2> <br />
<h3>Name: h3</h3> <br />
<h4>Name: h4</h4> <br />
<h5>Name: h5</h5> <br />
<h6>Name: h6</h6> <br />
<head>Name: head</head> <br />
<header>Name: header</header> <br />
<hgroup>Name: hgroup</hgroup> <br />
<hr>Name: hr</hr> <br />
<html>Name: html</html> <br />
<i>Name: i</i> <br />
<iframe>Name: iframe</iframe> <br />
<img>Name: img</img> <br />
<input>Name: input</input> <br />
<ins>Name: ins</ins> <br />
<kbd>Name: kbd</kbd> <br />
<keygen>Name: keygen</keygen> <br />
<label>Name: label</label> <br />
<legend>Name: legend</legend> <br />
<li>Name: li</li> <br />
<link>Name: link</link> <br />
<mark>Name: mark</mark> <br />
<map>Name: map</map> <br />
<menu>Name: menu</menu> <br...

CSS

*:not(br):after {
    content: 'it works';
    font-weight: bold;
    padding: 5px;
    color: green;
}