The GestureEvent is a proprietary interface specific to WebKit which gives information regarding multi-touch gestures. Events using this interface include gesturestart, gesturechange, and gestureend.

This interface also inherits properties of its parents, UIEvent and Event.

GestureEvent.rotation Read only Non-standard

Change in rotation (in degrees) since the event's beginning. Positive values indicate clockwise rotation; negative values indicate counterclockwise rotation. Initial value: 0.0.

GestureEvent.scale Read only Non-standard

Distance between two digits since the event's beginning. Expressed as a floating-point multiple of the initial distance between the digits at the beginning of the gesture. Values below 1.0 indicate an inward pinch (zoom out). Values above 1.0 indicate an outward unpinch (zoom in). Initial value: 1.0.

This interface also inherits methods of its parents, UIEvent and Event.

GestureEvent.initGestureEvent() Non-standard

Initializes the value of an GestureEvent. If the event has already been dispatched, this method does nothing.

• gesturestart
• gesturechange
• gestureend

Not part of any specification. Apple has a description at the Safari Developer Library.