https://cms.math.ca/wp-content/plugins/katex/assets/render.js?ver=2.2.5

1function _katexRender(rootElement) {
2  const eles = rootElement.querySelectorAll(".katex-eq:not(.katex-rendered)");
3  for (let idx = 0; idx < eles.length; idx++) {
4    const ele = eles[idx];
5    ele.classList.add("katex-rendered");
6    try {
7      katex.render(ele.textContent, ele, {
8        displayMode: ele.getAttribute("data-katex-display") === "true",
9        throwOnError: false,
10      });
11    } catch (n) {
12      ele.style.color = "red";
13      ele.textContent = n.message;
14    }
15  }
16}
17
18function katexRender() {
19  _katexRender(document);
20}
21
22document.addEventListener("DOMContentLoaded", function () {
23  katexRender();
24
25  // Perform a KaTeX rendering step when the DOM is mutated.
26  const katexObserver = new MutationObserver(function (mutations) {
27    [].forEach.call(mutations, function (mutation) {
28      if (mutation.target && mutation.target instanceof Element) {
29        _katexRender(mutation.target);
30      }
31    });
32  });
33
34  const katexObservationConfig = {
35    subtree: true,
36    childList: true,
37    attributes: true,
38    characterData: true,
39  };
40
41  katexObserver.observe(document.body, katexObservationConfig);
42});