chromium/chrome/test/data/extensions/platform_apps/web_view/guest_focus_test/main.html

<!doctype html>
<!--
Copyright 2016 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
  <body style=
    "width: 400px; height: 400px; margin: 0px; padding: 0px;">
    <div>
      <input type='text' id='other-focusable-element'
       style="position: absolute; left: 5px; top: 5px; width: 10px; height: 10px;">
    </div>
    <div id="webview-tag-container"></div>
    <script src="main.js"></script>
  </body>
</html>