Hack MathJax to use as a TeX to MathML converter.

tex2mathml.js

          MathJax.Hub.Register.MessageHook("End PreProcess", function () {
			  [].slice.apply(document.querySelectorAll("script[type^=math]")).forEach(function (s) {
				  var mml = MathJax.InputJax.TeX.Parse(s.innerHTML).mml();
				  
				  var math = document.createElementNS("http://www.w3.org/1998/Math/MathML", "math");
				  math.setAttribute("xmlns", "http://www.w3.org/1998/Math/MathML");
				  // tricks toMathML extension 
				  mml.parent = {};
				  var mathml = mml.toMathML()
				  math.innerHTML = mathml
				  s.parentElement.replaceChild(math, s);
			  });
          });

          MathJax.Hub.Queue(["PreProcess", MathJax.Hub, document.body]);