MediaWiki:Gadget-mathjax.js

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// adapted from https://ja.wikisource.org/wiki/MediaWiki:Gadget-mathjax.js
// originally https://gist.github.com/pkra/794a1d9a35ae2428eaff
 
var mathTags = $('.mjax');
if (mathTags.length > 0){ //only do something when there's math on the page
  window.MathJax = { //hook into MathJax's configuration
    AuthorInit: function () {
      MathJax.Hub.Register.StartupHook("End",function () { //when MathJax is done...
        MathJax.Hub.Queue(
            function(){
             mathTags.show(); // .. make the span around the mathy part visible
             $('.mjax-fallback').hide(); //hide fallback
            }
        );
      });
    }
  };
  mw.loader.load('https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS_CHTML');//load MathJax with a suitable combined config file
}