onLeave
OnLeave refers to a callback or handler name used in user interface programming to respond when a user action causes the pointer, focus, or active element to depart from a target element. The term is commonly encountered in event-driven UI frameworks and libraries as a semantic label for the moment a user leaves the element's interactive area.
In web development the most familiar reference is the mouseleave event. The mouseleave event fires when the
OnLeave is also used in libraries to denote exit or cleanup actions for components, such as closing
When implementing onLeave handlers, developers should account for accessibility and mobile devices where hover interactions are