code: @Nonnull
    public static HeightSpec perc (@Nonnegative final float fPerc)
    {
      ValueEnforcer.isGT0 (fPerc, "Perc");
      return new HeightSpec (EValueUOMType.PERCENTAGE, fPerc);
    }
docs: Create a height element with an percentage value.
  
  @param fPerc
  The height percentage to use. Must be &gt; 0.
  @return Never <code>null</code>.