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Version: Canary 🚧

Math Equations

Mathematical equations can be rendered using KaTeX.

Usage​

Please read KaTeX documentation for more details.

Inline​

Write inline math equations by wrapping LaTeX equations between $:

Let $f\colon[a,b]\to\R$ be Riemann integrable. Let $F\colon[a,b]\to\R$ be
$F(x)=\int_{a}^{x} f(t)\,dt$. Then $F$ is continuous, and at all $x$ such that
$f$ is continuous at $x$, $F$ is differentiable at $x$ with $F'(x)=f(x)$.
http://localhost:3000

Let f ⁣:[a,b]→Rf\colon[a,b] \to \R be Riemann integrable. Let F ⁣:[a,b]→RF\colon[a,b]\to\R be F(x)=∫axf(t) dtF(x)= \int_{a}^{x} f(t)\,dt. Then FF is continuous, and at all xx such that ff is continuous at xx, FF is differentiable at xx with F′(x)=f(x)F'(x)=f(x).

Blocks​

For equation block or display mode, use line breaks and $$:

$$
I = \int_0^{2\pi} \sin(x)\,dx
$$
http://localhost:3000
I=∫02πsin⁡(x) dxI = \int_0^{2\pi} \sin(x)\,dx

Configuration​

To enable KaTeX, you need to install remark-math and rehype-katex plugins.

npm install --save remark-math@5 rehype-katex@6
caution

Make sure to use remark-math >= 5 and rehype-katex >= 6 for Docusaurus v3 (using MDX v2).

Those 2 plugins are now only available as ESM packages, and you will need to import them dynamically.

First, turn your site config into an async config creator function:

docusaurus.config.js
module.exports = async function createConfigAsync() {
  return {
    // your site config...
  };
};

It is now possible to import the plugins dynamically and add them to your content plugin or preset options (usually @docusaurus/preset-classic docs options):

remarkPlugins: [(await import('remark-math')).default],
rehypePlugins: [(await import('rehype-katex')).default],

Include the KaTeX CSS in your config under stylesheets:

stylesheets: [
  {
    href: 'https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.css',
    type: 'text/css',
    integrity:
      'sha384-odtC+0UGzzFL/6PNoE8rX/SPcQDXBJ+uRepguP4QkPCm2LBxH3FA3y+fKSiJ+AmM',
    crossorigin: 'anonymous',
  },
],

Overall the changes look like:

docusaurus.config.js
module.exports = async function createConfigAsync() {
  return {
    title: 'Docusaurus',
    tagline: 'Build optimized websites quickly, focus on your content',
    presets: [
      [
        '@docusaurus/preset-classic',
        {
          docs: {
            path: 'docs',
            remarkPlugins: [(await import('remark-math')).default],
            rehypePlugins: [(await import('rehype-katex')).default],
          },
        },
      ],
    ],
    stylesheets: [
      {
        href: 'https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.css',
        type: 'text/css',
        integrity:
          'sha384-odtC+0UGzzFL/6PNoE8rX/SPcQDXBJ+uRepguP4QkPCm2LBxH3FA3y+fKSiJ+AmM',
        crossorigin: 'anonymous',
      },
    ],
  };
};

Self-hosting KaTeX assets​

Loading stylesheets, fonts, and JavaScript libraries from CDN sources is a good practice for popular libraries and assets, since it reduces the amount of assets you have to host. In case you prefer to self-host the katex.min.css (along with required KaTeX fonts), you can download the latest version from KaTeX GitHub releases, extract and copy katex.min.css and fonts directory (only .woff2 font types should be enough) to your site's static directory, and in docusaurus.config.js, replace the stylesheet's href from the CDN URL to your local path (say, /katex/katex.min.css).

docusaurus.config.js
module.exports = {
  stylesheets: [
    {
      href: '/katex/katex.min.css',
      type: 'text/css',
    },
  ],
};