[Quick spike] As a UX designer/Engineer, I want to investigate if we can hide details behind hover-based interactions so that users can choose whether to see additional information.

Scope:

• information that is already there
• extra information that we have to get e.g. from wikidata
• photos
• links, e.g. to places in wikidata or diffs (note that the wikidata black hover over doesn't have links currently)
• actions e.g. clicking on a settings button

Priorities:

• info to inform UX interviews
• increase understanding for engineers

Acceptance Criteria:

• Research potential performance impact.
• What if there is no javascript (if we use the hovers extension)
• Comparison of the engineering effort/size of the different options for implementation - e.g. part of wikibase, or using hovers extension
• A summary for product/UX

Checklist

• Research UI context for hover-based tooltips in Wikipedia
• Would it cause an issue for loading times
• Check if it's enabled for recent changes and for watchlist
• See the existing research on this from the web team:
  • Extensive documentation here
• “Why it took a long time to build that tiny link preview on Wikipedia” - blog post from Jon Robson
  • https://diff.wikimedia.org/2018/05/09/page-previews-documentation/
• add task
• add task