title: Can I run JavaScript in the browser without HTML? Why/Why Not?
body: <p>I'm new to web development and I'm wondering if it's possible to run a JavaScript file in the browser <strong>without</strong> using HTML and a <code>&lt;script&gt;</code> tag, and without using a framework.</p>
  <p>I'm only asking because in React (using <code>create-react-app</code>), the <code>index.js</code> file just runs in the browser without any HTML file loading it in. <strong>How is this possible?</strong></p>
  <p>Any links/articles/insight would be greatly appreciated.</p>