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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)
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web.
* **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://jsperf.com/katex-vs-mathjax/).
* **Print quality:** KaTeXs layout is based on Donald Knuths 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.
KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, and IE 8 - IE 11.
## Usage
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:
```html
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.1.1/katex.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.1.1/katex.min.js"></script>
```
#### In-browser rendering
Call `katex.render` with a TeX expression and a DOM element to render into:
```js
katex.render("c = \\pm\\sqrt{a^2 + b^2}", element);
```
#### Server side rendering or rendering to a string
To generate HTML on the server or to generate an HTML string of the rendered math, you can use `katex.renderToString`:
```js
var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}");
// '<span class="katex">...</span>'
```
Make sure to include the CSS and font files, but there is no need to include the JavaScript.
#### Rendering options
You can provide an object of options as the last argument to `katex.render` and `katex.renderToString`. Available options are:
- `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`)
For example:
```js
katex.render("c = \\pm\\sqrt{a^2 + b^2}", element, { displayMode: true });
```
## Contributing
See [CONTRIBUTING.md](CONTRIBUTING.md)
## License
KaTeX is licensed under the [MIT License](http://opensource.org/licenses/MIT).