photonstorm/phaser — pull request #1318 by pnstickne (2014-11-12 12:00:29+00:00)
Title: Mouse Scroll Events - added support for WheelEvent, fixes

- Added support for the Wheel Event, which is the DOM3 spec.

- Wheel Scroll Event (old non-FF) and DOM Mouse Wheel (old FF) are
supported via a non-exported reused wrapper object, WheelEventProxy.
The proxy methods are generated one-time dynamically; future changes
to the Mouse class (such as requiring an opt-in for mouse scroll events)
could bypass secondary stub generation.

- FIX: Only ONE of the mouse wheel events is listened too, newest standard first.
This fixes a bug in FF where it would use the default DOMMouseWheel.

This should fix https://github.com/photonstorm/phaser/issues/1313