chromium/ash/webui/firmware_update_ui/resources/index.html

<!-- Copyright 2021 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file. -->
<!DOCTYPE html>
<html dir="$i18n{textdirection}" lang="$i18n{language}">
<head>
  <meta name="color-scheme" content="light dark">
  <meta charset="utf-8">
  <title></title>
  <link rel="stylesheet" href="chrome://resources/css/text_defaults_md.css">
  <link rel="stylesheet" href="chrome://resources/css/md_colors.css">
  <link rel="stylesheet" href="chrome://theme/colors.css?sets=legacy,sys">
  <link rel="stylesheet" href="chrome://theme/typography.css">
  <style>
    body {
      background-color: var(--cros-bg-color);
      box-sizing: border-box;
      margin-bottom: 40px;
      margin-inline: 40px;
      margin-top: 32px;
      position: relative;
    }

    @media (prefers-color-scheme: dark) {
      body {
        background-color: var(--cros-bg-color-elevation-2);
      }
    }
  </style>
</head>
<body class="jelly-enabled">
    <firmware-update-app></firmware-update-app>

    <script type="module" src="firmware_update_app.js"></script>
    <!-- Below mojo script required to run browser tests -->
    <script src="chrome://resources/mojo/mojo/public/js/mojo_bindings_lite.js">
    </script>
</body>
</html>