JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<div data-background-icon="\f086"></div>

CSS

div::before {
  content: attr(data-background-icon);
  font-family: "FontAwesome";
}