Augmented web

The Augmented Web is a combination of HTML5, Web Audio, WebGL, and WebRTC that improves the experience of users on existing pages on the web.
It was the focus of a Birds of a Feather meeting at ISMAR2012 and is now the focus of the W3C Augmented Web Community Group.
Implementation.
Browser support is evolving quickly and can best be monitored using services like Can I Use.