Jaiffa (Javascript Interactive Fiction/Adventures) is a toy library for the creation of text adventures that can be embedded in a Web page. It was created as a programming exercise and idea testbed. Jaiffa is small, fast, and easy to use, study or modify. See the included HTML files for details. (Also available on the project website.)
Jaiffa was made for learning purposes. For real-world usage, you might want to watch David Wheeler's fork Jiffo.