MathML
- Mathematical Markup Language (MathML) Version 3.0 2nd Edition
http://www.w3.org/TR/MathML/
MathML is a markup language for describing mathematics. It is usually expressed in XML syntax, although HTML and other syntaxes are possible. - Mathematical markup language - Wikipedia
https://en.wikipedia.org/wiki/Mathematical_markup_language
A mathematical markup language is a computer notation for representing mathematical formulae, based on mathematical notation. - MathJax
http://www.mathjax.org
MathJax is an open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all modern browsers. - MathML Central: Convert Expression to MathML
http://www.mathmlcentral.com/Tools/ToMathML.jsp
Enter an expression in the text area below or choose a randomly selected expression, and then click the Generate button to produce the MathML.Validate MathML.Plot MathML. - W3C Math
http://www.w3.org/Math/
Official page W3C Working Group. Specification, Resources, Software List, FAQ.