JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="output"></pre>

JavaScript

var outputs = [
    'window.devicePixelRatio = ' + window.devicePixelRatio,
    'navigator.userAgent = ' + navigator.userAgent,
    'screen.width = ' + screen.width
];
document.getElementById('output').textContent = outputs.join('\n');