WebVR provides support for exposing virtual-reality devices like the Oculus Rift to web apps, enabling developers to create virtual-reality experiences that run on any WebGL-enabled browser.
The WebVR API spec
Overview, interface, and methods of the WebVR API, on MDN
WebVR is enabled in experimental builds of Chromium created by Google engineer Brandon Jones
MozVR’s open-source framework for creating WebVR worlds with markup
A starting point for web-based VR experiences that work in both Cardboard and Oculus