In the https://api.jquery.com/category/events/event-object/, we have

The following properties are also copied to the event object, though some of their values may be undefined depending on the event:

altKey, bubbles, button, cancelable, charCode, clientX, clientY, ctrlKey, currentTarget, data, detail, eventPhase, metaKey, offsetX, offsetY, originalTarget, pageX, pageY, relatedTarget, screenX, screenY, shiftKey, target, view, which

which property is deprecated by the DOM specification - https://w3c.github.io/uievents/#widl-KeyboardEvent-which, it seems we need to add a note about it (and possible for the other properties too), deprecated it and show message in the migrate?

/cc @dmethvin