The time at which the event was created, in seconds, as the times of frame events are. Browsers count from the page’s time origin, as performance.now() does, while view.dispatchMouseEvent(type, point[, options]) and view.dispatchKeyEvent(type, key[, options]) use Date.now() unless the host passes a time, so only compare the times of events from the same source.
Cancels the event if it is cancelable, and stops stopping further propagation of the event. This is has the same effect as calling both stopPropagation() and preventDefault().
Any handler can also return false to indicate that stop() should be called right after.