Remove the follow properties:
* clear (wasn't used)
* list-style-* (wasn't used)
* outline (only used a few times; can be achieved with borders or
box-shadow).
* mask (not well-supported in browsers; only used a few times for
effects that could be achieved in other ways).
* text-decoration-* (use the shorthand property)
* text-transform (can be achieved in other ways)
9a3e003272