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chromium/chrome/browser/resources/chromeos/multidevice_setup/multidevice_setup_dialog.html 

<!doctype html>
<html dir="$i18n{textdirection}" lang="$i18n{language}" cros>
<head>
  <meta charset="utf8">
  <base href="chrome://multidevice-setup">
  <link rel="stylesheet" href="chrome://resources/css/md_colors.css">
  <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=sys">
  <title>$i18n{dialogAccessibilityTitle}</title>
  <style>
    html,
    body {
      display: flex;
      height: 100%;
      margin: 0;
      overflow: hidden;
      width: 100%;
    }
  </style>
</head>
<body>
  <multidevice-setup-post-oobe></multidevice-setup-post-oobe>
  <script type="module" src="multidevice_setup_post_oobe.js"></script>
</body>
</html>