Within the action string of the DroppableWidget, the startactions and endactions of the DraggableWidget, the action string of the ButtonWidget and the action string of the LinkCatcherWidget and the EventCatcherWidget, the modifier variable contains the modifier key(s) held during the drag, click or other event. Possible key combinations are listed in the table below.

The variable contains a string that identifies the keys:

Test modifier keys here

Modifier keys held while clicking the button above: