Problem: Sometimes articles are changed a lot of times within a short time frame. In that case, people want to know easily which are the revisions that belong to that time frame, to just look at those.
While this is possible to define in the history view, the revision slider does not offer any help about it just yet.
On the revision slider, ever xth bar has a label indicating the date of the change.
Background: This is part of adding the revision slider to the revision diff page. The revision slider is a feature that adds a visualization of all revisions to the compare screen.
The revision slider was originally prototyped by the WMF Community Tech team and then handed over to the WMDE TCB team, as it is also a solution to fulfill a wish of the German Community Wishlist: https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche_2015/Artikel#Anzeige_aller_Bearbeitungskommentare_im_Diff