Introduce legends and tooltips so that users, that are not familiar with the blue and yellow highlights, can better understand the type of edits.
== Feature Summary ==
On the current experience, new users might not be able to understand an edit.
Add a legend that would explain the colour highlights within a diff view. Add tooltips to yellow and blue highlighted areas that would indicate the type of edit when a user hovers over them.
== User Story ==
- As a user of the diff tool, I want to see a legend to explain the symbology.
- As a viewer of the Unified Inline Wikitext Diff on Desktop, I will be able to see a legend so that I can understand what visual markers mean.
- As a viewer of the Unified Inline Wikitext Diff on Desktop, I will be able to see a tooltip that indicates "Content deleted" when hovering over a yellow highlighted area.
- As a viewer of the Unified Inline Wikitext Diff on Desktop, I will be able to see a tooltip that indicates "Content added" when hovering over a blue highlighted area.
== Benefits ==
- Newcomers will better understand the different type of edits.