 by 25px -5px with 15px 50px, smooth by 15px 35px)'},
      ]);

      test_interpolation({
        property: 'offset-path',
        from: 'shape(from 5% 5px, arc to 15% -15px of 10px 20px, arc by 15% -5px of 30px 30px cw rotate 30deg large, arc to 25% 20px of 10px 5px small)',
        to: 'path("M 15 15 A 20,30 0 0,0 5,-25 a 20,20 270 0,1 25,-15 A 10,5 0 0,0 25 20")',
      }, [
        {at: -0.3, expect: 'shape(from calc(6.5% - 4.5px) 2px, arc to calc(19.5% - 1.5px) -12px of 7px 17px, arc by calc(19.5% - 