HTML5 is a buzzword these days but also a sign of time. It will mark this current period, the level reached by technologies, the transition of functionality from desktops to the web and mobile devices. In a couple of years it will probably be laughed at but currently it is the cutting edge of widely available distributed applications.
To see HTML related topics, visit HTML page and JavaScript page.
Overview of HTML5 (link).
Tools:
Games
Also check links at JavaScript page and related libraries.
See IndexedDB page.