Initiates when a form filler moves the pointer out of the field, even if the form filler is pressing the mouse button. It is not initiated when the pointer moves out of the field for a different reason; for example, because an overlapping window opens.
You can use this event to provide visual feedback to a form filler in conjunction with the mouseEnter event. For example, you can use this event to return the border or background color of an object to its original value to help visually indicate to form fillers that they are no longer working in a specific field.
See also 

mouseExit event