mylloon.fr/static/js/libs/katex.js

window.addEventListener("load", () => {
  const macros = {};
  for (const item of new Map(
    Object.entries({
      N: "mathbb{N}",
      R: "mathbb{R}",
      Z: "mathbb{Z}",
      O: "Theta",
      ra: "rightarrow",
      la: "leftarrow",
      RA: "Rightarrow",
      LA: "Leftarrow",
      u: "mu",
    })
  )[Symbol.iterator]()) {
    macros[`\\${item[0]}`] = `\\${item[1]}`;
  }

  document.querySelectorAll("span[data-katex]").forEach((element) => {
    const rawLaTeXFormula = element.getAttribute("data-katex");
    const displayMode = rawLaTeXFormula.startsWith("$$");
    const strip = displayMode ? 2 : 1;

    katex.render(
      rawLaTeXFormula.slice(strip, rawLaTeXFormula.length - strip),
      element,
      {
        throwOnError: false,
        macros,
        displayMode,
        output: "mathml",
      }
    );
  });
});