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<!DOCTYPE html>
<meta charset="utf-8">
<script src="/cookies/resources/cookie-helper.sub.js"></script>
<script>
  window.addEventListener('load', function() {
    window.opener.postMessage({ type: 'LOADED' }, '*');
  });

  window.addEventListener('message', function(e) {
    if (SECURE_ORIGIN !== window.location.origin)
      return;

    if (e.data.type === "initialize-iframe")
      window.frames[0].location = e.data.url;
    if (e.data.type === "navigate-iframe")
      window.frames[0].postMessage({ type: 'navigate', url: e.data.url }, '*');

    // Relay messages sent by the subframe to the opener.
    if (e.data.type === 'FRAME_READY')
      window.opener.postMessage({ type: 'FRAME_READY' }, '*');

    if (e.data.type === 'FRAME_COOKIES_SET')
      window.opener.postMessage({ type: 'FRAME_COOKIES_SET', cookies: e.data.cookies }, '*');
  });
</script>
<iframe></iframe>