Clickable is the element that will generate BUTTON_CLICK and BUTTON_PRESS events but is not normally “TAB traversable”. That is typical behavior of toolbar buttons.
There are no elements that have this behavior applied by default.
It does not use any specific attributes other than common attributes like disabled or id.
Together with the standard set of events (mouse, keyboard, focus) it generates:
spacebar key click when button is in focus. Posted (asynchronous) eventspacebar key down when button is in focus. Synchronous event.