1# [<img src="https://khan.github.io/KaTeX/katex-logo.svg" width="130" alt="KaTeX">](https://khan.github.io/KaTeX/) [](https://travis-ci.org/Khan/KaTeX) 2 3[](https://gitter.im/Khan/KaTeX?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) 4 5KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. 6 7 * **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/). 8 * **Print quality:** KaTeX’s layout is based on Donald Knuth’s TeX, the gold standard for math typesetting. 9 * **Self contained:** KaTeX has no dependencies and can easily be bundled with your website resources. 10 * **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. 11 12KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, and IE 8 - IE 11. A list of supported commands can be on the [wiki](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX). 13 14## Usage 15 16You 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: 17 18```html 19<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/katex.min.css"> 20<script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/katex.min.js"></script> 21``` 22 23#### In-browser rendering 24 25Call `katex.render` with a TeX expression and a DOM element to render into: 26 27```js 28katex.render("c = \\pm\\sqrt{a^2 + b^2}", element); 29``` 30 31If KaTeX can't parse the expression, it throws a `katex.ParseError` error. 32 33#### Server side rendering or rendering to a string 34 35To generate HTML on the server or to generate an HTML string of the rendered math, you can use `katex.renderToString`: 36 37```js 38var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}"); 39// '<span class="katex">...</span>' 40``` 41 42Make 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. 43 44#### Rendering options 45 46You can provide an object of options as the last argument to `katex.render` and `katex.renderToString`. Available options are: 47 48- `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`) 49- `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`) 50- `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`) 51 52For example: 53 54```js 55katex.render("c = \\pm\\sqrt{a^2 + b^2}", element, { displayMode: true }); 56``` 57 58#### Automatic rendering of math on a page 59 60Math 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. 61 62## Contributing 63 64See [CONTRIBUTING.md](CONTRIBUTING.md) 65 66## License 67 68KaTeX is licensed under the [MIT License](http://opensource.org/licenses/MIT). 69
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