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The WebRTC (Web Real-Time Communications) API is primarily known for its support for audio and video communications; however, it also offers peer-to-peer data channels. These channels let you send text or binary data over an active connection to a peer. This article explains more about this, and shows you how to use libraries to implement data channels in your game.
Browser compatibility
Currently, to use WebRTC data channels, you'll need a build of Firefox Nightly or of Chrome Canary. They also work on Firefox OS.
Note: We need a formal compatibility table here at some point.