Elemental - webkit only?

[emurmur]

I'm using Elemental and writing some code that needs requestAnimationFrame.  Elemental has Window.webkitRequestAnimationFrame(), which only works on webkit browsers (but not on earlier ones, like the Android 2.3 or 3.1 browsers).  It does not work on Firefox or IE.  There is a common shim used in Javascript to handle this (which works in all my test cases).  So, that brings up the question, how and when will these other modern browsers get Elemental support?  Is the plan to create a hybrid IDL and generator that targets common features, using shims where necessary?  Or will the compiler generate separate code for multiple IDLs and targets (in which case, it will still need to generate common names based on the 'standard' IDL)?  Anything you can tell me will be helpful.  Thanks.