[franciscop]

Nope, could be made with <strike> as well, but swapping element tags takes more characters than toggling a class. In the case of UmbrellaJS I made a .wrap() method, but since there is no .unwrap() again it takes more than toggling classes.

[vukgr]

Ah, fair. The challenge itself didn't mention toggling (just crossing tasks off), so you could probably get away with it; But that's just the golfer in me talking I guess.