JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<h1>This is a heading</h1>
<h3>The ::before pseudo-element inserts content before the content of an element.</h3>

<h1>This is a heading</h1>
<h3>IE8 supports the content property only if a !DOCTYPE is specified.</h3>
</div>

CSS

h1::before {
    content: "///";
    color: red;
}
 h3::after {
    content: "***";
    color: green;
}