Thats why there should be fallbacks and whatnot to keep the details correct. I as a learner cant make it the way like the author of the lesson intended. i might put an unnecessary whitespace somewhere, I might forget semicolons, I might add stuff thats not required but still works for the lesson. Im linking you to one of the problems I encountered and for which many people reported bugs and provided fixes yet nothing was done (or could be done?)
Lesson:
Hint page:
I did it correctly the first time yet I got every error possible and I still dont know what caused it. Yes case sensitive checked, tracker disabled, page refreshed absolutely everything. I couldnt get it to pass, yet when I straight up copy paste the solution from the hint page it worked. why? idk! I can only imagine it was a whitespace issue (which shouldnt be an issue)