Star Sovereign is a realtime multiplayer space shooter implemented in HTML5 / WebSockets / WebGL that pits players against each other in a fast-paced, action-filled deathmatch. It is currently under development (early alpha). You can play the game here: starsovereign.com
Should give you a decent idea of the gameplay - however, keep in mind that the resolution and frame rate are lower than what you should expect during actual gameplay (video encoding). I'll try to upload higher resolution / higher frame rate videos in the future.