1. types: `<gradient>`: `conic-gradient()`: hue interpolation method

  2. types: `<gradient>`: `linear-gradient()`: hue interpolation method

  3. types: `<gradient>`: `radial-gradient()`: hue interpolation method

  4. types: `<gradient>`: `repeating-conic-gradient()`: hue interpolation method

  5. types: `<gradient>`: `repeating-linear-gradient()`: hue interpolation method

  6. types: `<gradient>`: `repeating-radial-gradient()`: hue interpolation method