chromium/chrome/browser/resources/browser_switch/internals/browser_switch_internals.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <title>Legacy Browser Support (LBS) - Internals</title>
  <link rel="stylesheet" href="chrome://resources/css/md_colors.css">
  <link rel="stylesheet" href="chrome://resources/css/text_defaults_md.css">
  <style>
    body {
      background-color: var(--md-background-color);
      margin: 0;
    }
  </style>
</head>

<body>
  <browser-switch-internals-app></browser-switch-internals-app>
  <script type="module" src="/internals/app.js"></script>
</body>
</html>