I just received the press release fora new app called AppLab from appMobi. It's a demo of basic HTML5 abilities, but it's also a testing platform. You can write your own code and see how it runs.
From the press release:
appMobi today announced immediate availability of its free “AppLab” interactive eBook app. AppLab is a free download in both the Apple App Store and the Android Market. The AppLab app is intended for people who are interested in creating mobile websites or native smartphone apps, and want to learn how to leverage the powerful new capabilities of HTML5. The interactive AppLab eBook app was created using the same HTML5 technology that is the subject of the book itself.
Interactive components of the eBook include working demos of fun HTML5 capabilities that access device functions and rival Flash, such as animation and multimedia. The eBook also provides users with the ability to download HTML source code snippets and even try out new code. After learning the techniques in the lessons, users can apply what they learned at http://www.appMobi.com and instantly see the results in the AppLab app.
Regarding AppLab, appMobi CEO Dave Kennedy said, “We believe in the unifying value of standards, which is why we fully support HTML5. appMobi offers, for the first time, a platform to truly democratize the development of apps. By combining AppLab with the appMobi XDK (also a free download), we’ve made it easy for anyone with basic Web skills to use HTML5 to create fully native, high performance apps for today’s most popular smartphone platforms — iPhone, iPad and Android.”