+ 15px) 25px with calc(15% + 10px) 45px / calc(-2.5% + 12.5px) 85px)'},
        {at: 1, expect: 'shape(from 15% 15px, curve by 20% 0px with 10% 60px, curve by 20% 30px with 30% 40px / -5% 100px)'},
        {at: 1.5, expect: 'shape(from calc(22.5% - 2.5px) 20px, curve by calc(30% - 5px) -5px with 15% 50px, curve by calc(30% - 15px) 35px with calc(45% - 10px) 35px / calc(-7.5% - 12.5px) 115px)'},
      ]);

      test_interpolation({
        property: 'offset-path',
        from: 'shape(from 5% 5px, smooth to