PostHTML is a tool to transform HTML/XML with JS plugins. PostHTML itself is very small. It includes only a HTML parser, a HTML node tree API and a node tree stringifier.

Syntax highlighting for the Web. 185 languages and 91 styles, automatic language detection and multi-language code highlighting.

Create complex, reactive, persistent web applications by just writing HTML & CSS, without a single line of JavaScript and no server backend. Developed in the Haystack Group at MIT CSAIL and led by Lea Verou.