If I set the percentComplete value for a task in a gantt-chart, the tooltipp is not visible for the slack-part.
This is a problem as we also can have 0% complete tasks (means 100% slack) - so there is no tooltipp available for the task and you can not identifiy it.
I see the same on all your online demos.
Not sure if there is an option to show a tooltipp in that cases - at least I did not find it out...
Thank you and best regards