return mOverflowX != NS_STYLE_OVERFLOW_VISIBLE && mOverflowX != NS_STYLE_OVERFLOW_CLIP;
return mOverflow != NS_STYLE_OVERFLOW_VISIBLE && mOverflow != NS_STYLE_OVERFLOW_CLIP;
  PRBool IsScrollableOverflow() const {    // mOverflowX and mOverflowY always match when one of them is    // NS_STYLE_OVERFLOW_VISIBLE or NS_STYLE_OVERFLOW_CLIP.    return mOverflowX != NS_STYLE_OVERFLOW_VISIBLE &&           mOverflowX != NS_STYLE_OVERFLOW_CLIP;  }