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Meta Why isn't \hline rendering here, when it does on Stack Exchange? [duplicate]

0 answers  ·  posted 4y ago by DNB‭  ·  closed as duplicate 3y ago by Monica Cellio‭

Question bug
#2: Question closed by user avatar Monica Cellio‭ · 2021-06-06T23:51:10Z (over 3 years ago)
#1: Initial revision by user avatar DNB‭ · 2021-02-09T23:31:05Z (almost 4 years ago) 
Why isn't \hline rendering here, when it does on Stack Exchange? 
Please see https://math.codidact.com/posts/280741. I just pasted it on Stack Exchange and my MathJax is rendered perfectly.
bug