wikipedia-mathjax-for-MathML+SVG-mode.js

// add to User:YOURNAME/common.js to get smooth MathJax rendering
var mathTags = $('.mwe-math-mathml-a11y');
if (mathTags.length > 0){ //only do something when there's math on the page
  window.MathJax = {
    SVG: {blacker: 1}, // clearer SVG output, in case people switch to SVG output
  	AuthorInit: function () {
  	  MathJax.Hub.Register.StartupHook("End",function () { //when MathJax is done...
  	    MathJax.Hub.Queue(
  	    	function(){
  		     mathTags.removeClass('mwe-math-mathml-a11y'); // .. make the span around MathML (now MathJax output) visible
  	    	 $('.mwe-math-fallback-image-inline').addClass('mwe-math-mathml-a11y'); //remove the SVG image thingie
  	    	}
  	    );
  	  });
  	}
  };
  mw.loader.load('https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=MML_HTMLorMML');
}