Something for later

mathml.js

Modernizr.addTest('mathml', function(){
  var hasMathML = false;
  if ( document.createElementNS ) {
    var ns = "http://www.w3.org/1998/Math/MathML",
        div = document.createElement("div");
        div.style.position = "absolute"; 
    var mfrac = div.appendChild(document.createElementNS(_namespace,"math"))
                   .appendChild(document.createElementNS(_namespace,"mfrac"));
    mfrac.appendChild(document.createElementNS(_namespace,"mi"))
         .appendChild(document.createTextNode("xx"));
    mfrac.appendChild(document.createElementNS(_namespace,"mi"))
         .appendChild(document.createTextNode("yy"));
    document.body.appendChild(div);
    hasMathML = div.offsetHeight > div.offsetWidth;
  }
  return hasMathML;
});