          el.style.borderTopWidth = `${fraq * parseFloat(style.borderTopWidth)}px`;
          el.style.borderBottomWidth = `${fraq * parseFloat(style.borderBottomWidth)}px`;
        }, () => {
          el.style.overflow = style.overflow;
          ['opacity', 'height', 'paddingTop', 'paddingBottom', 'marginTop', 'marginBottom', 'borderTopWidth', 'borderBottomWidth'].forEach((name) => {
            (el.style as any)[name] = (style as any)[name];
          });
        });
      } else done();