owerCase());
    var currentActual = actualRange.startContainer;
    var currentExpected = expectedRange.startContainer;
    var actual = "";
    var expected = "";
    while (currentActual && currentExpected) {
      actual = indexOf(currentActual) + "-" + actual;
      expected = indexOf(currentExpected) + "-" + expected;

      currentActual = currentActual.parentNode;
      currentExpected = currentExpected.parentNode;
    }
    actual = actual.substr(0, actual.length - 1);
    expected = expected.subst