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    \$\begingroup\$ I think your colors are not correct. But apart from that I'd upvote your post if only for the title:) \$\endgroup\$ Commented Apr 17, 2019 at 6:56
  • 1
    \$\begingroup\$ It seems mathjax uses the css color names. So you could replace purple with fuchsia and teal with aqua and green with lime then things would be correct I think. \$\endgroup\$ Commented Apr 17, 2019 at 7:02
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    \$\begingroup\$ Just note that the PPCG community was never famous for its sanity. If anything probably for the lack thereof. \$\endgroup\$ Commented Apr 17, 2019 at 8:51
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    \$\begingroup\$ \rule{5em}{5em} -> \rule 5em 5em \$\endgroup\$ Commented Apr 17, 2019 at 10:01
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    \$\begingroup\$ The \color{something} command doesn't take a text argument like \textcolor{something}{tex to be coloured}, rather it's a switch, so you can save two bytes by removing the extra pair of braces around \rule: \def\c#1{\color{#1}\rule{5em}{5em}}. Also, in proper TeX ~ is an active character so you can replace all \c by ~ and save a couple more bytes. Don't know about MathJax though. \$\endgroup\$ Commented Apr 17, 2019 at 11:30