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<!DOCTYPE html>
<script>
  if (opener) {
    // We're the popup.  Send back our state.  What we really want to send is
    // our origin, but that will come automatically.
    opener.postMessage(undefined, "*");
    self.close();
  } else {
    // We're the child.  Start listening for messages and open ourselves as the
    // popup.
    onmessage = function (e) {
      parent.postMessage({ data: e.data, origin: e.origin }, "*");
    };
    popupWin = window.open(location.href);
  }
</script>