Was watching a great intro video about CSS positioning from CSS-Tricks, and found a great site:
It’s a pretty boss CSS / HTML renderer, in that you don’t have to reload the page every time like jsfiddle
And it integrates with github so you can save your code directly there, which is pretty sweet.
Here’s an example URL:
(don’t make fun of my code!!)
And the corresponding github gist:
Best of all, you can use Gravatar as a login.