The LayoutTest suppport method eventSender.zoomPageIn and eventSender.zoonPageOut result in page zoom factors that do not match the browser standard zoom factors (25%, 33%, 50%, 67%, 75%, 80%, 90%, 100% etc). As a result, we do not always test zoomed rendering behavior in a way that users will see. Given that snapping behavior is very sensitive to actual zoom values, we should test the same thing that we show users.