A new GWT development mode that is no longer using the browser plugin.
The Super Development Mode (SDM) allows GWT developers to quickly recompile their code (incrementally) and see the results in a browser. It also allows developers to debug the running GWT application in the browser. Developers can even debug Java code if they are using a browser that supports source maps.
A big advantage compared to the Classic Development Mode is the fact, that no plugin is needed anymore and the applications can be tested on various browsers (even mobile).