highlightjs

Highlight.js is a JavaScript library that provides syntax highlighting for code blocks on web pages. It runs in the browser and can automatically detect the programming language of code blocks, or apply a specified language. Highlight.js applies syntax highlighting through CSS classes, which are styled by themes.

Features include broad language support, automatic detection, extensive themes, and no external dependencies. It can be used both on the client side in browsers and on the server side with Node.js, enabling dynamic or static site generation.

Usage typically involves including the library and a CSS theme, then calling a function such as hljs.highlightAll() after the page content loads. You can also highlight individual blocks with hljs.highlightBlock or specify the language with class attributes like class='language-python'.

Highlight.js was created by Ivan Sagalaev and released as an open-source project. It has grown into a widely adopted, community-maintained tool with contributions across many languages and environments.

Licensing: It is released under a permissive open-source license.