Markdeep

Markdeep is an extended variant of Markdown intended to be viewed in a web browser, as it is implemented via JavaScript which takes a text document (with Markdown syntax and some additional features) and converts it to HTML for display. You simply add a line at the bottom that references the Markdeep script (both the remote copy at its creator's site, and a local copy if present for offline use) and also provides a default CSS presentation for the plain-text version as a fallback.

Enhanced features include converting ASCII art diagrams into real graphics.

The piece of code you're supposed to add to the end of the document is:

Links

 * Official site
 * Feature demo
 * Markdeep script