stop-immediate-propagation: true [every (time)] [after (time)];
This command immediate stops other events of the same type external from Active CSS from being called.
It will also do a regular stop-propagation in Active CSS at the same time, so bubbling will stop for that event, but only for that event. We haven't found a use case for stopping bubbling on all Active CSS events of the same type, so this hasn't yet been implemented. If you need this functionality completed, let us know your exact use case so we can replicate something similar and we will put it into the roadmap.