Pretty, fast client-side markdown is really easy Posted by thepicard on Sunday May 05, 2013 @03:46AM from the thepicard.org dept. http://www.thepicard.org/realtime-markdown/ With great open-source libraries of course. ( 2 comments | 2 points | on HN )
Refused to execute script from 'https://github.com/chjj/marked/raw/master/lib/marked.js because its MIME type ('text/plain') is not executable, and strict MIME type checking is enabled.
FF not happy either
ReferenceError: marked is not defined
https://code.google.com/p/chromium/issues/detail?id=180007 describes the issue, specifically mentioning raw.github.com, which I am using. I would guess you are using newer-than-stable browsers?