[https://games.etherpad.mozilla.org/20 Feedback from Games Work Week]
There is a draft spec for a property |[Update] window.performance.now| that meets the needs game developers described to us. The property returns a floating-point value () is now available in milliseconds. There's a little more discussion required on the spec itself to get everyone on board, but Mozilla and WebKit are both ready to implement.Firefox 15!
See [http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime/Overview.html] for the spec.