Webpack the result, and use it in a web page:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>MathJax 3 in a Browser</title>
<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>
<script src="mathjax3-simple.min.js"></script>
</head>
<body>
Inline math: $\sqrt{x+1}$. Display math: $$\frac{x+1}{x-1}.$$
</body>
</html>
Inline math: $\sqrt{x+1}$. Display math: $$\frac{x+1}{x-1}.$$