This video, recorded by the Saarland University Computer Graphics Department, demonstrates XML3D Physics.

Summary of the video description: XML3D Physics adds rigid body simulation to XML3D. Physics parameters are attached to the XML3D scene in the DOM. A plugin combines these parameters with the scene geometry to run the simulation using the Bullet physics engine. Renderers ignore the physics annotations, so the same scene can be displayed in a native XML3D browser or a browser with WebGL and JavaScript support.