code: @Nonnull
    public static HCCol perc (@Nonnegative final int nPerc)
    {
      return new HCCol ().setWidth (ECSSUnit.perc (nPerc));
    }
docs: Create a new column with a certain percentage.
  
  @param nPerc
  The percentage to be used. Should ideally be between 0 and 100.
  @return Never <code>null</code>.