Atrum Castellum
MathML
HTML5
TestingArea
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Apparently: Chrome 24 renders this properly, where Chrome 25 does not.

It works fine in Firefox and Opera.

IE still does not support MathML tags. I know, shocker there. </sarcasm>

Doing some more digging, I found this neat little gem: MathJax:

Poisson Probability:

P x = μ x * e x !

Standard Deviation:

σ = 1 N i = 1 N ( x i μ ) 2

The Quadratic Formula:

x = b ± b 2 4 a c 2 a