Files opened from disk can run JS. But you can't do <script src="otherfile.js"> ...

cxr · on Feb 22, 2024

  ~/scratch/wrong$ cat ./index.html
  <!doctype html>
  <html>
  <head>
  <script src="otherfile.js"></script>
  </head>
  <body>
  <p>otherfile.js did not run</p>
  </body>
  </html>

  ~/scratch/wrong$ cat ./otherfile.js 
  window.onload = (() => {
    document.querySelector("p").textContent = "wrong.  (otherfile.js ran)";
  });