I add a problem with exercise 12: whatever I write it runs infinitely and never says if it is OK or not... so you can't unlock the next lesson.
I couldn't find the solution on this forum, but I finally find how to do and write it here to help people who has the same problem.
I deleted the content of .js and .html - so it is clearly wrong but there is no loop. You do it 3 times and then, a help appear to ask you if you want to continue or get code - so get code and you have the correct answer and unlock the next lesson.
It is probably not the perfect solution, but it unlock the next lessons...
I had the same problem. It definitely looks like a bug, someone please fix it!
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