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

<!doctype html>
<!--
Copyright 2013 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
<head>
<style type="text/css">
body { margin:0; padding:0; }
</style>
</head>
<body>
  <div style="padding-left: 40px; padding-top: 60px;">
    <webview></webview>
  </div>
  <script src="main.js"></script>
</body>
</html>