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				|  | @ -6,6 +6,16 @@ permalink: /docs/extras/ | |||
| There are a number of (optional) extra features that Jekyll supports that you | ||||
| may want to install, depending on how you plan to use Jekyll. | ||||
| 
 | ||||
| ## Web Highlights and Commenting  | ||||
| 
 | ||||
| Register your site with [txtpen](https://txtpen.com). Then append  | ||||
| 
 | ||||
| ```html | ||||
|     <script src="https://txtpen.com/embed.js?site=<your site name>" /> | ||||
| ``` | ||||
| 
 | ||||
| to your template files in `/_layout` folder. | ||||
| 
 | ||||
| ## Math Support | ||||
| 
 | ||||
| Kramdown comes with optional support for LaTeX to PNG rendering via [MathJax](https://www.mathjax.org) within math blocks. See the Kramdown documentation on [math blocks](http://kramdown.gettalong.org/syntax.html#math-blocks) and [math support](http://kramdown.gettalong.org/converter/html.html#math-support) for more details. MathJax requires you to include JavaScript or CSS to render the LaTeX, e.g. | ||||
|  |  | |||
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