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What syntax highlighting is used on GitHub (for HTML, CSS, JavaScript, C#) when viewing source code-file and is it available for the public to use?
It works on the page and it works when embedding on a page (from a Gist), like this:
<script src="https://gist.github.com/1009439.js"></script> But can I just include their JavaScript-library and let it highlight my code?
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We use Linguist to perform language detection and to select third-party grammars for syntax highlighting. You can find out which keywords are valid in the languages YAML file.
To link to multiple lines of highlighted code, select your first line of code and then CTRL+SHIFT click on the last line of code you want to highlight. Notice the URL is now appended with a range of line numbers (e.g. https://github.com/…/functions.php#L117-L148).
You can also create a Markdown hyperlink by highlighting the text and using the keyboard shortcut Command + V .
Github uses pygments to highlight syntax. Pygments is running on the server, instead of a pure Javascript client solution. If you're looking for a Javascript solution check out this review of the various options.
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According to this help page, GitHub currently highlights syntax with the open-source Linguist library for Ruby. Linguist highlights each language using the tmLanguage files linked in vendor/grammars.
Since Linguist is written in Ruby, it can only be used on the server. If you want a client-side JavaScript library that you can just include on a page, you will have to find a different library.
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