This would overwrite any other classes as well, which might be fine if you don’t have any but could lead to bugs later on if you forget about this behavior. I

This would overwrite any other classes as well, which might be fine if you don’t have any but could lead to bugs later on if you forget about this behavior. I don’t really think the point brought up by the other commenters is an issue. If the `no-js` class is missing, that’s a bug. Allowing it to be missing or present makes the behavior hard to reason about: If there is neither a `js` or `no-js` class, what is the desired behavior? If the elimination of coupling is desired, maybe we should get rid of the `no-js` class altogether and interpret the absence of a `js` class to indicate no js. I think I like this solution best.