JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<span>foo</span>
<span class="foo">foo</span>
</div>

CSS

div > span, div > span.foo {
    color: red;
}

.foo {
    color: blue;
}

JavaScript

<div.
<span>hacking</span>
<span class="news">hacking</span>
</div>