chromium/chrome/browser/resources/chromeos/borealis_installer/borealis_installer.html

<!DOCTYPE HTML>
<html dir="$i18n{textdirection}" lang="$i18n{language}"></html>
<html>
  <meta charset="utf-8">
  <link rel="stylesheet" href="chrome://resources/css/text_defaults_md.css">
  <link rel="stylesheet" href="chrome://resources/chromeos/colors/cros_styles.css">
  <borealis-installer-app></borealis-installer-app>
  <script type="module" src="app.js"></script>
</html>