This feature is experimental. Please share your experiences so we know what to keep or change.
Runs a callback when the given event is observed on the given element or its ancestors.
up.event.onClosest(element, 'click', function() { // chip: Someone clicked on element or its ancestors })
The element to observe with its ancestors.
The callback to run.
It will be called with the observed event.
A function that unsubscribes the callback.
When the element is destroyed, the callback will be unsubscribed automatically.
