Fiddle Salad – An Online IDE & Code Playground
Fiddle Salad is a fresh web development tool, an online IDE, for client-side web applications.
All the code is written in a single-page interface and the output is displayed/rendered instantly.
There is built-in code completion support for CSS + jQuery and links to the documentation for the properties of each language.
With a free membership, it is possible to create any number of projects and save them for re-working on them without losing any settings or data.