code: @Nonnull
    public CSSSimpleValueWithUnit setUnit (@Nonnull final ECSSUnit eUnit)
    {
      m_eUnit = ValueEnforcer.notNull (eUnit, "Unit");
      return this;
    }
docs: Set the unit type.
  
  @param eUnit
  The new unit to set. May not be <code>null</code>.
  @return this
  @since 3.7.3