Q:

Is Stack Overflow going to create its own jsFiddle-style sandbox environment?

At least with everything HTML, CSS, and JavaScript related, it seems like everyone is either providing a jsFiddle, or requesting a fiddle in the comments. 
Does anyone know if Stack Overflow has any plans to develop or integrate something similar to jsFiddle and other scripting sandboxes right on the page in question and answer posts?
I think it would be spectacular if you could play with the code in a question the same way you can in jsFiddle without having to leave the page or provide links in your comments/answers. It would be beyond spectacular if they could create similar test environments for PHP, ASP.NET, and whatever other languages you could play with online. 
They could base the use of such things off of reputation if they wanted to.
Does anyone else think this would be an awesome feature? Is it possible that we could see something like this in the near future?

A:

This is done - blame Haney: Feedback requested: Runnable code snippets in questions and answers

