MouseEvent.webkitForce Non-Standard Read only This lets you, for example, determine whether a mouse event was generated by an actual mouse or by a touch event (which might affect the degree of accuracy with which you interpret the coordinates associated with the event). The type of device that generated the event (one of the MOZ_SOURCE_* constants). MouseEvent.mozInputSource Non-Standard Read only Instead of using this deprecated (and non-standard) property, you should use PointerEvent and look at its pressure property. The amount of pressure applied to a touch or tablet device when generating the event this value ranges between 0.0 (minimum pressure) and 1.0 (maximum pressure). MouseEvent.mozPressure Non-Standard Deprecated Read only Returns true if the shift key was down when the mouse event was fired. The Y coordinate of the mouse pointer in global (screen) coordinates. The X coordinate of the mouse pointer in global (screen) coordinates. The secondary target for the event, if there is one. If no hit region is affected, null is returned. Returns the id of the hit region affected by the event. The Y coordinate of the mouse pointer relative to the whole document.

The X coordinate of the mouse pointer relative to the whole document. The Y coordinate of the mouse pointer relative to the position of the padding edge of the target node. The X coordinate of the mouse pointer relative to the position of the padding edge of the target node. The Y coordinate of the mouse pointer relative to the position of the last mousemove event. The X coordinate of the mouse pointer relative to the position of the last mousemove event. Returns true if the meta key was down when the mouse event was fired. Returns the vertical coordinate of the event relative to the current layer. Returns the horizontal coordinate of the event relative to the current layer. Returns true if the control key was down when the mouse event was fired. The Y coordinate of the mouse pointer in local (DOM content) coordinates. The X coordinate of the mouse pointer in local (DOM content) coordinates. The buttons being pressed (if any) when the mouse event was fired. The button number that was pressed (if applicable) when the mouse event was fired. User Agent: Mozilla/5.0 (Windows NT 6.1 WOW64 rv:39.0) Gecko/20100101 Firefox/39.0 Build ID: 20150630154324 Steps to reproduce: A google map that is inside a div with any margin or padding has mouse coordinates offset by the same padding or margin. Returns true if the alt key was down when the mouse event was fired. This interface also inherits properties of its parents, UIEvent and Event.

Firefox mouse coordinates