text: (function () {
      var newMathJax = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js';
      var oldMathJax = 'cdn.mathjax.org/mathjax/latest/MathJax.js';
  
      var replaceScript = function (script, src) {
          //
          //  Make redirected script
          //
          var newScript = document.createElement('script');
          newScript.src = newMathJax + src.replace(/.*?(\?|$)/, '$1');
          //
          //  Move onload and onerror handlers to new script
          //
          newScript.onload = script.onload;
          newScript.onerror = script.onerror;
          script.onload = script.onerror = null;
          //
          //  Move any content (old-style configuration scripts)
          //
          while (script.firstChild) newScript.appendChild(script.firstChild);
          //
          //  Copy script id
          //
          if (script.id != null) newScript.id = script.id;
          //
          //  Replace original script with new one
          //
          script.parentNode.replaceChild(newScript, script);
          //
          //  Issue a console warning
          //
          console.warn(
              'WARNING: cdn.mathjax.org has been retired. Check https://www.mathjax.org/cdn-shutting-down/ for migration tips.'
          )
      }
  
      if (document.currentScript) {
          var script = document.currentScript;
          replaceScript(script, script.src);
      } else {
          //
          // Look for current script by searching for one with the right source
          //
          var n = oldMathJax.length;
          var scripts = document.getElementsByTagName('script');
          for (var i = 0; i < scripts.length; i++) {
              var script = scripts[i];
              var src = (script.src || '').replace(/.*?:\/\//, '');
              if (src.substr(0, n) === oldMathJax) {
                  replaceScript(script, src);
                  break;
              }
          }
      }
  })();