Whilst we see, read and hear a lot about the new semantic elements in HTML5 we arguably hear far less about the application programming interfaces (APIs) that make up a large part of the specification itself.

In some cases the APIs have been around and implemented for a while, but they’ve never been documented; something which HTML5 has set out to change.

.Net Magazine has published an article: The developer’s guide to the HTML5 APIs, which we’re not going to look at code but instead we’ll focus on describing the APIs, their purpose and progress. So that you will be in the right direction to find out more.

Source: http://www.netmagazine.com/features/developer-s-guide-html5-apis