From mediawiki.org

If you run your private wiki you can allow that users can input formulae in different input formats. For this, you have to add $wgMathEnableExperimentalInputFormats = true; to your local config. Then you can use two additional input modes which can be enabled via one of the following type attributes:

Presentation MathML

For example asciimath (asciimath.org) input can be entered as

<math type="ascii">d/dxf(x)=lim_{h->0}(f(x+h)-f(x))/h</math>

and will produce a rendering like

These options are not available on this wiki or any other Wikimedia foundation wiki.