Problem: The current labeling does not help and might even be misleading
Why we want to change that: We tested the revision slider with two users. Both of them did not understand the legend as such. They thought the "older" and "newer" labels were links that behaved like the arrows on the side. The y-axis label "diff size" was not understood by one person, the other oversaw it, and had figured out itself what the y-axis meant.
Solution:
- Remove the current legend (y-axis with "diff size" label, "older, newer")
- Add a tooltip for the arrows. When the users hover over the left arrow, show "See older revisions". When they hover over the right arrow, show "See younger revisions"
Background: The revision slider is a feature that adds a visualization of all revisions to the compare screen. Revisions are represented as bars on a line and can be selected using two pointers. 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