1. css property: -webkit-mask-position-x

2. css property: -webkit-mask-position-y

3. css property: mask-position

4. css property: mask-position: bottom

5. css property: mask-position: center

6. css property: mask-position: left

7. css property: mask-position: right

8. css property: mask-position: top

9. css property: mask-position: x-end

10. css property: mask-position: x-start

11. css property: mask-position: y-end

12. css property: mask-position: y-start