The obvious spoiler alert here is that CSS won and JSSS lost, right? It’s not that simple. A lot of the ideas from JSSS have slowly been creeping back into our toolset. SASS brought a lot of programming logic back into styling our applications. CSS has even picked up variables and the ability to do calculations along the way. Finally, the React community has been—maybe unknowingly—bringing JSSS back from the dead. In this talk, we’ll take a good hard look at JSSS and discuss what it got right and wrong, why CSS won, and the ways in which JSSS has had enduring legacy after its untimely demise.