code: @Nonnull
    @Nonempty
    public String getAsString ()
    {
      return CCSSValue.PREFIX_HSLA_OPEN +
             m_sHue +
             ',' +
             m_sSaturation +
             ',' +
             m_sLightness +
             ',' +
             m_sOpacity +
             CCSSValue.SUFFIX_HSLA_CLOSE;
    }
docs: {@inheritDoc}
  
  @since 3.8.3