This an update of sorts on some things happening in the HTML5/Javascript world.  First, here are some previous posts on this topic, to catch you up to speed:

• What is the Platform of the Future for Developing Interactive Graphical Educational Software? – I argue for HTML5/Javascript, since Java and Flash do not run on (all) mobile/tablet platforms
• A Snapshot of the HTML5/Javascript Universe – a listing of various open source projects, libraries, and tools available to use
• Browser-Based IDEs – this is the future, I believe – doing coding in the browser.  Some updates are [...]