PRBool operator==(const nsCSSValuePair& aOther) const { return mXValue == aOther.mXValue && mYValue == aOther.mYValue;
PRBool operator==(const nsCSSRect& aOther) const { return mTop == aOther.mTop && mRight == aOther.mRight && mBottom == aOther.mBottom && mLeft == aOther.mLeft;
  PRBool operator==(const nsCSSValuePair& aOther) const {    return mXValue == aOther.mXValue &&           mYValue == aOther.mYValue;  }