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Concerning this answer: How do I make \mapsto and \longmapsto point from right to left?

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$\newcommand{\testleft}{\leftarrow\!\shortmid}\newcommand{\testleftlong}{\longleftarrow\!\shortmid}$ I was only able to come up with this:
\newcommand{\testleft}{\leftarrow\!\shortmid}
\newcommand{\testleftlong}{\longleftarrow\!\shortmid}
which gives this: $\testleft$ and $\testleftlong$

The suggestions from Left version of \mapsto at TeX.SE don't work in mathjax: $\leftmapsto$, $\mapsfrom$.

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  • $\begingroup$ For now, I'm going with this one. $\endgroup$ – Michael Hardy Oct 24 '12 at 17:27
  • $\begingroup$ robjohn suggested this \longleftarrow{\raise{.4pt}{\hspace{-5pt}\shortmid}} in his comment. $\endgroup$ – Martin Sleziak Oct 27 '12 at 9:27
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Unfortunately, \mapsfrom does not seem to be supported in MathJax, but that is what you are looking for, I believe. However, there is a \leftarrowtail: $\leftarrowtail$

There is a closed thread on the $\TeX$ board. The thread that this was closed as a duplicate of points to a useful tool: Detexify, which does not find the \mapsfrom symbol (for me at least).

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  • $\begingroup$ Detexify gives me mapsfrom. $\endgroup$ – Phira Oct 25 '12 at 22:57
  • $\begingroup$ @Phira: After many tries, I did get \mapsfrom. However, \mapsfrom is not supported in MathJax. Something like $\longleftarrow{\raise{.4pt}{\hspace{-5pt}\shortmid}}$ could be used instead. $\endgroup$ – robjohn Oct 26 '12 at 7:16

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