chromium/chrome/browser/resources/ash/settings/os_settings.html

<!doctype html>
<html dir="$i18n{textdirection}" lang="$i18n{language}" class="loading"
    cros $i18n{chromeRefresh2023Attribute}>
<head>
  <meta charset="utf-8">
  <title>$i18n{settings}</title>
  <base href="chrome://os-settings">
  <link rel="stylesheet" href="chrome://resources/css/text_defaults_md.css">
  <link rel="stylesheet" href="chrome://resources/chromeos/colors/cros_styles.css">
  <link rel="stylesheet" href="chrome://theme/colors.css?sets=legacy,sys">
  <link rel="stylesheet" href="chrome://theme/typography.css">
  <link rel="stylesheet" href="/css/base.css">
</head>
<body class="jelly-enabled">
  <script type="module" src="os_settings.js"></script>
  <os-settings-ui></os-settings-ui>
</body>
</html>