854 		position.adjusted = PLUGINS.viewport(
859 		if(offset && position.adjusted.left) { position.left += offset.left; }
860 		if(offset && position.adjusted.top) {  position.top += offset.top; }
864 	else { position.adjusted = { left: 0, top: 0 }; }  class in position
868 	delete position.adjusted;
2456 			adjust = pos.adjusted,
2944 		adjusted = { left: 0, top: 0 },  class in PLUGINS.viewport
2950 		return adjusted;
2954 	containerOffset = container.offset() || adjusted;
2962 	viewportOffset = viewport.offset() || adjusted;
3030 	adjusted = {  class
3040 	return adjusted;