[vukgr]

Am I missing something or did everyone forget <s> is a thing in html?

[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.

[rukshn]

I also thought of using the <s> tag, but I didn’t use it because it is considered to be an outdated tag

But yes that is totally possible