I tried this code, but it seems there is something not correct. Everything is ok except that the button "show" when clicked nothing shows up. I mean spoiler is used to hide/show some text, right! so why this code doesn't do this job then!! or maybe I'm missing something here. please correct me if I'm wrong.
By the way, I did all exact steps many times, but still the hide/show function doesn't work...
any idea?
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