--- id: browser title: Browser --- > KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, Edge, and IE 9–11. ## CDN (Content Delivery Network) Use CDN to deliver KaTeX to your project: ```html ``` KaTeX also provides minified versions: ```html ``` > The loading of scripts are [deferred using `defer` attribute](https://developer.mozilla.org/en/HTML/Element/script#Attributes) to speed up page rendering. The `katex` object will be available after [`DOMContentLoaded` event is fired on the `document`](https://developer.mozilla.org/ko/docs/Web/Reference/Events/DOMContentLoaded). If you do not use `defer`, `katex` object will be available after corresponding `script` tag. > If KaTeX is not used immediately or not critical, it is possible to load KaTeX asynchronously. Add [`async` attribute](https://developer.mozilla.org/en/HTML/Element/script#Attributes) to `script` and use [`rel="preload"` and `onload` attribute](https://github.com/filamentgroup/loadCSS) on `link`. > You can prefetch KaTeX fonts to prevent FOUT or FOIT. Use [Web Font Loader](https://github.com/typekit/webfontloader) or add [``](https://developer.mozilla.org/en-US/docs/Web/HTML/Preloading_content) to `head`. (Note that only few browsers [support `rel="preload"`](https://caniuse.com/#feat=link-rel-preload) and they all support WOFF2 so preloading WOFF2 fonts is enough.) You can use Chrome DevTools Network panel or similar to find out which fonts are used. ECMAScript module is also available: ```html ``` > Use [`nomodule` attribute](https://developer.mozilla.org/en/HTML/Element/script#Attributes) to provide a fallback for older browsers that do not support ES modules. ## Download & Host Things Yourself Download a [KaTeX release](https://github.com/Khan/KaTeX/releases), copy `katex.js`, `katex.css` (or `katex.min.js` and `katex.min.css` to use minified versions), and the `fonts` directory, and include like above. You can also build from source. See [Building from Source](node.md#building-from-source) for more details. ## Bundler Use [Node.js package managers](node.md) to install KaTeX and require it in your project. Then bundle using bundlers like [webpack](https://webpack.js.org/) or [rollup.js](https://rollupjs.org/). Note that you have to bundle the stylesheet (`katex.css`) or include it manually.