Stylo is a web app designer written in CoffeeScript and Spine. It allows you to manipulate various HTML elements, add styles and edit text.

You can find a demo here (webkit only).

The code should provide good examples of how to achieve the following:

• Element snapping, resizing and drag/drop
• Copy/paste, undo/redo & keyboard shortcuts
• Context menus and z-index ordering
• Color picker using canvas
• JSON object instance serialization

For more information, please see the blog post.