What is jQuery (edge) in jsfiddle.net?
It is the jQuery nightly build from github...
jQuery JavaScript Library v1.6.3pre Live From Git (b22c9046529852c7ce567df13397849e11e2b9cc)
Here is the link: link (jsfiddle uses this)
Here is the jQuery github link: github-link
An edge build usually refers to some kind of "nightly" or not yet released build. The cutting edge, basically the latest source packaged up.