Difference between requestAnimationFrame and requestAnimFrame

Question

There seems to be a little documentation on this but i'm wondering what the difference is between the two? They seem to be the same (?) in Pixi

Answer 1

requestAnimFrame is a JavaScript polyfill to implement requestAnimationFrame for browsers that don't yet support requestAnimationFrame or for browsers that still prefix it.

See http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/ for one of the first implementations of requestAnimFrame.