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# [<img src="https://khan.github.io/KaTeX/katex-logo.svg" width="130" alt="KaTeX">](https://khan.github.io/KaTeX/) | ||
[![Build Status](https://travis-ci.org/Khan/KaTeX.svg?branch=master)](https://travis-ci.org/Khan/KaTeX) | ||
[![codecov](https://codecov.io/gh/Khan/KaTeX/branch/master/graph/badge.svg)](https://codecov.io/gh/Khan/KaTeX) | ||
[![Join the chat at https://gitter.im/Khan/KaTeX](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/Khan/KaTeX?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) | ||
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KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. | ||
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* **Fast:** KaTeX renders its math synchronously and doesn't need to reflow the page. See how it compares to a competitor in [this speed test](http://www.intmath.com/cg5/katex-mathjax-comparison.php). | ||
* **Print quality:** KaTeX’s layout is based on Donald Knuth’s TeX, the gold standard for math typesetting. | ||
* **Self contained:** KaTeX has no dependencies and can easily be bundled with your website resources. | ||
* **Server side rendering:** KaTeX produces the same output regardless of browser or environment, so you can pre-render expressions using Node.js and send them as plain HTML. | ||
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KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, Edge, and IE 9 - IE 11. More information can be found on the [list of supported commands](https://khan.github.io/KaTeX/function-support.html) and on the [wiki](https://github.com/khan/katex/wiki). | ||
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## Usage | ||
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You can [download KaTeX](https://github.com/khan/katex/releases) and host it on your server or include the `katex.min.js` and `katex.min.css` files on your page directly from a CDN: | ||
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```html | ||
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0-beta1/katex.min.css" integrity="sha384-VEnyslhHLHiYPca9KFkBB3CMeslnM9CzwjxsEbZTeA21JBm7tdLwKoZmCt3cZTYD" crossorigin="anonymous"> | ||
<script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0-beta1/katex.min.js" integrity="sha384-O4hpKqcplNCe+jLuBVEXC10Rn1QEqAmX98lKAIFBEDxZI0a+6Z2w2n8AEtQbR4CD" crossorigin="anonymous"></script> | ||
``` | ||
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#### In-browser rendering | ||
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Call `katex.render` with a TeX expression and a DOM element to render into: | ||
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```js | ||
katex.render("c = \\pm\\sqrt{a^2 + b^2}", element); | ||
``` | ||
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If KaTeX can't parse the expression, it throws a `katex.ParseError` error. | ||
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#### Server side rendering or rendering to a string | ||
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To generate HTML on the server or to generate an HTML string of the rendered math, you can use `katex.renderToString`: | ||
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```js | ||
var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}"); | ||
// '<span class="katex">...</span>' | ||
``` | ||
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Make sure to include the CSS and font files, but there is no need to include the JavaScript. Like `render`, `renderToString` throws if it can't parse the expression. | ||
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#### Security | ||
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Any HTML generated by KaTeX *should* be safe from `<script>` or other code | ||
injection attacks. | ||
(See `maxSize` below for preventing large width/height visual affronts.) | ||
Of course, it is always a good idea to sanitize the HTML, though you will need | ||
a rather generous whitelist (including some of SVG and MathML) to support | ||
all of KaTeX. | ||
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#### Handling errors | ||
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If KaTeX encounters an error (invalid or unsupported LaTeX), then it will | ||
throw an exception of type `katex.ParseError`. The message in this error | ||
includes some of the LaTeX source code, so needs to be escaped if you want | ||
to render it to HTML. In particular, you should convert `&`, `<`, `>` | ||
characters to `&`, `<`, `>` (e.g., using `_.escape`) | ||
before including either LaTeX source code or exception messages in your | ||
HTML/DOM. (Failure to escape in this way makes a `<script>` injection | ||
attack possible if your LaTeX source is untrusted.) | ||
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#### Rendering options | ||
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You can provide an object of options as the last argument to `katex.render` and `katex.renderToString`. Available options are: | ||
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- `displayMode`: `boolean`. If `true` the math will be rendered in display mode, which will put the math in display style (so `\int` and `\sum` are large, for example), and will center the math on the page on its own line. If `false` the math will be rendered in inline mode. (default: `false`) | ||
- `throwOnError`: `boolean`. If `true`, KaTeX will throw a `ParseError` when it encounters an unsupported command. If `false`, KaTeX will render the unsupported command as text in the color given by `errorColor`. (default: `true`) | ||
- `errorColor`: `string`. A color string given in the format `"#XXX"` or `"#XXXXXX"`. This option determines the color which unsupported commands are rendered in. (default: `#cc0000`) | ||
- `macros`: `object`. A collection of custom macros. Each macro is a property with a name like `\name` (written `"\\name"` in JavaScript) which maps to a string that describes the expansion of the macro. Single-character keys can also be included in which case the character will be redefined as the given macro (similar to TeX active characters). | ||
- `colorIsTextColor`: `boolean`. If `true`, `\color` will work like LaTeX's `\textcolor`, and take two arguments (e.g., `\color{blue}{hello}`), which restores the old behavior of KaTeX (pre-0.8.0). If `false` (the default), `\color` will work like LaTeX's `\color`, and take one argument (e.g., `\color{blue}hello`). In both cases, `\textcolor` works as in LaTeX (e.g., `\textcolor{blue}{hello}`). | ||
- `maxSize`: `number`. If non-zero, all user-specified sizes, e.g. in `\rule{500em}{500em}`, will be capped to `maxSize` ems. Otherwise, users can make elements and spaces arbitrarily large (the default behavior). | ||
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For example: | ||
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```js | ||
katex.render("c = \\pm\\sqrt{a^2 + b^2}\\in\\RR", element, { | ||
displayMode: true, | ||
macros: { | ||
"\\RR": "\\mathbb{R}" | ||
} | ||
}); | ||
``` | ||
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#### Automatic rendering of math on a page | ||
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Math on the page can be automatically rendered using the auto-render extension. See [the Auto-render README](contrib/auto-render/README.md) for more information. | ||
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#### Font size and lengths | ||
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By default, KaTeX math is rendered in a 1.21× larger font than the surrounding | ||
context, which makes super- and subscripts easier to read. You can control | ||
this using CSS, for example: | ||
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```css | ||
.katex { font-size: 1.1em; } | ||
``` | ||
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KaTeX supports all TeX units, including absolute units like `cm` and `in`. | ||
Absolute units are currently scaled relative to the default TeX font size of | ||
10pt, so that `\kern1cm` produces the same results as `\kern2.845275em`. | ||
As a result, relative and absolute units are both uniformly scaled relative | ||
to LaTeX with a 10pt font; for example, the rectangle `\rule{1cm}{1em}` has | ||
the same aspect ratio in KaTeX as in LaTeX. However, because most browsers | ||
default to a larger font size, this typically means that a 1cm kern in KaTeX | ||
will appear larger than 1cm in browser units. | ||
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### Common Issues | ||
- Many Markdown preprocessors, such as the one that Jekyll and GitHub Pages use, | ||
have a "smart quotes" feature. This changes `'` to `’` which is an issue for | ||
math containing primes, e.g. `f'`. This can be worked around by defining a | ||
single character macro which changes them back, e.g. `{"’", "'"}`. | ||
- KaTeX follows LaTeX's rendering of `aligned` and `matrix` environments unlike | ||
MathJax. When displaying fractions one above another in these vertical | ||
layouts there may not be enough space between rows for people who are used to | ||
MathJax's rendering. The distance between rows can be adjusted by using | ||
`\\[0.1em]` instead of the standard line separator distance. | ||
- KaTeX does not support the `align` environment because LaTeX doesn't support | ||
`align` in math mode. The `aligned` environment offers the same functionality | ||
but in math mode, so use that instead or define a macro that maps `align` to | ||
`aligned`. | ||
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## Libraries | ||
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### Angular2+ | ||
- [ng-katex](https://github.com/garciparedes/ng-katex) Angular module to write beautiful math expressions with TeX syntax boosted by KaTeX library | ||
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### Ruby | ||
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- [katex-ruby](https://github.com/glebm/katex-ruby) Provides server-side rendering and integration with popular Ruby web frameworks (Rails, Hanami, and anything that uses Sprockets). | ||
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## Contributing | ||
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See [CONTRIBUTING.md](CONTRIBUTING.md) | ||
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## License | ||
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KaTeX is licensed under the [MIT License](http://opensource.org/licenses/MIT). |
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