code: public TableCellStyleBuilder borderTop(final Length size, final Color borderColor,
                                             final BorderAttribute.Style style) {
          final BorderAttribute bs = new BorderAttribute(size, borderColor, style);
          this.bordersBuilder.top(bs);
          return this;
      }
docs: Add a border style for the top border of this cell.
  
  @param size        the size of the line
  @param borderColor the color to be used in format #rrggbb e.g. '#ff0000' for a red border
  @param style       the style of the border line, either BorderAttribute.BORDER_SOLID or BorderAttribute.BORDER_DOUBLE
  @return this for fluent style