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<!doctype html>
<html>
<head>
<script>
  // Override the |frames| property to test that such overrides are
  // properly ignored cross-origin.
  window.frames = "override";

  // If we get a postMessage, we grab references to everything and set
  // document.domain to trim off our topmost subdomain.
  window.onmessage = function(evt) {
    window.windowReferences = [];
    window.locationReferences = [];
    for (var i = 0; i < parent.length; ++i) {
      windowReferences.push(parent[i]);
      locationReferences.push(parent[i].location);
    }
    document.domain = document.domain.substring(document.domain.indexOf('.') + 1);
    evt.source.postMessage('', '*');
  }

  function checkWindowReferences() {
    for (var i = 0; i < parent.length; ++i) {
      if (windowReferences[i] != parent[i])
        throw new Error("Window references don't match for " + i + " after document.domain");
      if (locationReferences[i] != parent[i].location)
        throw new Error("Location references don't match for " + i + " after document.domain");
    }
    return true;
  }
</script>
</head>
<body>
</body>
</html>