Mondrian is a free vector graphics web app like Adobe Illustrator or Inkscape. Mondrian offers all the tools needed to create, modify, and export simple SVG files. Mondrian also supports undo/redo through a file history API that stores operations.
The entire app is written in Coffeescript. You have to manually compile the app every time you make changes. Mondrian officially supports only the latest desktop stable versions of Chrome, Firefox, and Safari. All of the Mondrian code and documentation is available under the MIT License.