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The WebKit team has been developing some cutting-edge proposals to extend CSS with the ability to do declarative animations and other effects. This ability is key to maintaining the three-fold separation of HTML content, CSS presentation, and JavaScript behavior. Animation effects on the Web today are accomplished with JavaScript code which repeatedly changes an element's style at a certain interval in order to create an animated effect. This practice, however, violates the separation between presentation and behavior because the animation behaviors are directly changing the document's presentation (i.e. modifying the style property). Ideally, all of the animation triggers and presentation states would be declared in CSS. And this is exactly what the WebKit team has proposed in its CSS Transitions specification.

Take a walk through the woods and learn about all things HTML5. Starting with the JS APIS (selector API, storage, appcache, web workers, web sockets, notifications, drag and drop, and geolocation). Then delve into the new HTML semantic tags, link relations, micro data, ARIA, forms, audio and video, Canvas, and WebGL. Finally, the holy trinity finishes with CSS and selectors, fonts, text, columns, stroking, opacity, HSL, rounded corners, gradients, shadows, backgrounds, transitions, transforms, and animations.