ntsByClassName("language-math");
      for (var i=0; i<maths.length; i++) {
          var el = maths[i];
          katex.render(el.innerText, el, {displayMode: true});
      }

      var codes = document.getElementsByTagName("code");
      for (i=0; i<codes.length; i++) {
          el = codes[i];
          if (el.classList.contains("language-math")) continue;
          if (el.classList.contains("language-inline-math")) {
              katex.render(el.innerText, el);
              continue;
          }

    