[DOM3 Event name] none [Event category] none [Event attribute name] onzoom [Event name and description] 
SVGZoom Occurs when the zoom level of a document view is being changed, either through a direct user interaction or any change to the currentScale property available on SVGSVGElement interface. This event is only applicable to outermost svg elements and is dispatched after the zoom level modification has taken place. The target of the event is the ‘svg’ element. SVGZoom events bubble but are not cancelable.