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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) | ||
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[![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. A list of supported commands can be found on the [wiki](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX). | ||
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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/0.8.0/katex.min.css" integrity="sha384-BDqcjN11/6D69oC63ObubLHNvQR2fNjin6+AzxA3xalB0swTj17TxVV1tL1Q5Png" crossorigin="anonymous"> | ||
<script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.8.0/katex.min.js" integrity="sha384-sKYm5us3z9/bRQA+cc3gPzqwI5RVgL8vJQx1lpBudr9IzHOR8fnFUH68dz1GsTQw" 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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#### 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. | ||
- `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}`). | ||
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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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## 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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