tion() {
    assert_equals(actualIframe.contentWindow.unexpectedException, null,
      "Unexpected exception thrown when setting up Range for actual cloneContents()");
    assert_equals(expectedIframe.contentWindow.unexpectedException, null,
      "Unexpected exception thrown when setting up Range for simulated cloneContents()");
    assert_equals(typeof actualRange, "object",
      "typeof Range produced in actual iframe");
    assert_equals(typeof expectedRange, "object",
      "typeof Range produced in e