rehype-mathjax
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!Chatchat-badgechatrehype plugin to render elements with a
language-math
class with
MathJax.Contents
* [`unified().use(rehypeMathjax[, options])`](#unifieduserehypemathjax-options)
* [`Options`](#options)
What is this?
This package is a unified (rehype) plugin to render math. You can add classes to HTML elements, use fenced code in markdown, or combine withremark-math
remark-math for a $C$
syntax extension.When should I use this?
This project is useful as it renders math with MathJax at compile time, which means that there is no client side JavaScript needed.A different plugin,
rehype-katex
rehype-katex, does the same but with
KaTeX.Install
This package is ESM onlyesm. In Node.js (version 18+), install with npm:npm install rehype-mathjax
In Deno with
esm.sh
esmsh:import rehypeMathjax from 'https://esm.sh/rehype-mathjax@5'
In browsers with
esm.sh
esmsh:<script type="module">
import rehypeMathjax from 'https://esm.sh/rehype-mathjax@5?bundle'
</script>
Use
Say our documentinput.html
contains:<p>
Lift(<code class="language-math">L</code>) can be determined by Lift Coefficient
(<code class="language-math">C_L</code>) like the following equation.
</p>
<pre><code class="language-math">
L = \frac{1}{2} \rho v^2 S C_L
</code></pre>
…and our module
example.js
contains:import rehypeMathjax from 'rehype-mathjax'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {read, write} from 'to-vfile'
import {unified} from 'unified'
const file = await unified()
.use(rehypeParse, {fragment: true})
.use(rehypeMathjax)
.use(rehypeStringify)
.process(await read('input.html'))
file.basename = 'output.html'
await write(file)
…then running
node example.js
creates an output.html
with:<p>
Lift(<mjx-container class="MathJax" jax="SVG"><!--…--></mjx-container>) can be determined by Lift Coefficient
(<mjx-container class="MathJax" jax="SVG"><!--…--></mjx-container>) like the following equation.
</p>
<mjx-container class="MathJax" jax="SVG" display="true"><!--…--></mjx-container>
<style>
mjx-container[jax="SVG"] {
direction: ltr;
}
/* … */
</style>
…open
output.html
in a browser to see the rendered math.API
This package has an export map with several entries for plugins using different strategies:rehype-mathjax/browser
— browser (±1kb)rehype-mathjax/chtml
— CHTMLmathjax-chtml (±154kb)rehype-mathjax/svg
— SVGmathjax-svg (±566kb)rehype-mathjax
— same as SVG
Each module exports the plugin
rehypeMathjax
api-rehype-mathjax as
the default export.unified().use(rehypeMathjax[, options])
Render elements with a language-math
(or math-display
, math-inline
)
class with MathJax.Parameters
options
(Options
api-options, typically optional)
— configuration
Returns
Transform (Transformer
unified-transformer).Options
Configuration (TypeScript type).Fields
chtml
(unknown
, optional)
— configuration for the output, when CHTML;
see [*CommonHTML Output Processor Options* on
`mathjax.org`][mathjax-chtml-options]
svg
(unknown
, optional)
— configuration for the output, when SVG;
see [*SVG Output Processor Options* on
`mathjax.org`][mathjax-svg-options]
tex
(unknown
, optional)
— configuration for the input TeX;
see [*TeX Input Processor Options* on
`mathjax.org`][mathjax-tex-options]
Notes
When usingrehype-mathjax/browser
, only options.tex.displayMath
and
options.tex.inlineMath
are used.
That plugin will use the first delimiter pair in those fields to wrap
math.
Then you need to load MathJax yourself on the client and start it with the
same markers.
You can pass other options on the client.When using
rehype-mathjax/chtml
, options.chtml.fontURL
is required.
For example:// …
.use(rehypeMathjaxChtml, {
chtml: {
fontURL: 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/output/chtml/fonts/woff-v2'
}
})
// …
Markdown
This plugin supports the syntax extension enabled byremark-math
remark-math.
It also supports math generated by using fenced code:````markdown
C_L
````HTML
The content of any element with alanguage-math
, math-inline
, or
math-display
class is transformed.
The elements are replaced by what MathJax renders.
Either a math-display
class or using <pre><code class="language-math">
will
result in “display” math: math that is a centered block on its own line.CSS
The HTML produced by MathJax does not require any extra CSS to render correctly.Types
This package is fully typed with TypeScript. It exports the additional typeOptions
api-options.Compatibility
Projects maintained by the unified collective are compatible with maintained versions of Node.js.When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line,
rehype-mathjax@^6
,
compatible with Node.js 18.This plugin works with unified version 6+ and rehype version 4+.
Security
Assuming you trust MathJax, usingrehype-mathjax
is safe.
A vulnerability in it could open you to a
cross-site scripting (XSS)wiki-xss attack.
Be wary of user input and use rehype-sanitize
rehype-sanitize.When you don’t trust user content but do trust MathJax, run
rehype-mathjax
after rehype-sanitize
:import rehypeMathjax from 'rehype-mathjax'
import rehypeSanitize, {defaultSchema} from 'rehype-sanitize'
import rehypeStringify from 'rehype-stringify'
import remarkMath from 'remark-math'
import remarkParse from 'remark-parse'
import remarkRehype from 'remark-rehype'
import {unified} from 'unified'
const file = await unified()
.use(remarkParse)
.use(remarkMath)
.use(remarkRehype)
.use(rehypeSanitize, {
...defaultSchema,
attributes: {
...defaultSchema.attributes,
// The `language-*` regex is allowed by default.
code: [['className', /^language-./, 'math-inline', 'math-display']]
}
})
.use(rehypeMathjax)
.use(rehypeStringify)
.process('$C$')
console.log(String(file))
Related
— same but with KaTeX
— highlight code blocks
— add links to headings
— sanitize HTML
— wrap a document around the tree
Contribute
Seecontributing.md
contributing in remarkjs/.github
health for ways
to get started.
See support.md
support for ways to get help.This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.