movement property

Point<num> movement
@DomName('MouseEvent.movementX'), @DomName('MouseEvent.movementY'), @Experimental(), @SupportedBrowser(SupportedBrowser.CHROME), @SupportedBrowser(SupportedBrowser.FIREFOX)

Implementation 

@DomName('MouseEvent.movementX')
@DomName('MouseEvent.movementY')
@SupportedBrowser(SupportedBrowser.CHROME)
@SupportedBrowser(SupportedBrowser.FIREFOX)
@Experimental()
Point get movement => new Point(_movementX, _movementY);