Epic Games announced a WebGL-based version of its Epic Citadel demo, you can try it out over here. At present, Epic recommends the latest nightly Firefox release for optimal performance. The regular Firefox release will also function, but it's slower than Firefox Nightly, and Chrome currently crashes, but this issue should be resolved soon. Other than that, Internet Explorer does not support WebGL in current versions, and Opera nor Safari are currently compatible with Epic Citadel.
Q: Can you explain a little about the technology that makes this possible?