event.data

An optional object of data passed to an event method when the current executing handler is bound.

event.metaKey

Indicates whether the META key was pressed when the event fired.

event.pageX

The mouse position relative to the left edge of the document.

event.pageY

The mouse position relative to the top edge of the document.

event.result

The last value returned by an event handler that was triggered by this event, unless the value was undefined.

event.stopPropagation()

Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event.

event.timeStamp

The difference in milliseconds between the time the browser created the event and January 1, 1970.

event.which

For key or mouse events, this property indicates the specific key or button that was pressed.