I noticed that the site does not seem to use the begingroup extension for MathJax, which could possibly lead to bugs: For example, a macro defined in a comment to a question could have an unexpected affect on an answer below it.

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    $\begingroup$ I believe that we have seen the effect of this in chat. \newcommand appearing in a comment persists until that statement rolls off the scrollback. This can mess up the $\LaTeX$ later on if the command is not done right. We have unofficially outlawed \newcommand etc. In chat. $\endgroup$ – robjohn Mod Jan 1 '13 at 18:18
  • $\begingroup$ This has been discussed before. $\endgroup$ – Asaf Karagila Mod Jan 1 '13 at 19:15
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    $\begingroup$ A related discussion: The scope of \newcommand is the entire page. Here is a poll, where you can vote which extensions should be included, in your opinion. $\endgroup$ – Martin Sleziak Jan 2 '13 at 12:46

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