== Background
As mobile web and desktop users gain the ability to save specific articles to their list on Wikipedia, we want to surface this feature to logged-out readers on mobile web to see if this would encourage them to create accounts at a higher rate compared to the existing "watch" star button. This experiment will compare the account creation rates between control (the "watch" star, with "login" as the primary CTA) and treatment (the "save" bookmark icon, with "create account" as the primary CTA)
Timeframe: Q4 FY25-26 (April-June, 2026)
**Hypothesis text**: //If we surface Reading Lists to invested logged-out readers on mobile web, the registration rate will increase by at least 2% relative to the control group.//
=== User story
//Add at least one user story.//
=== Design requirements
| Control | Treatment |
| {F72908662} | {F72908670} |
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== Requirements
=== Acceptance criteria
- [] //Add clear acceptance criteria.//
=== BDD
- //For QA engineer to fill out.//
=== Test Steps
- //For QA engineer to fill out.//
=== Communication criteria
//Add if this needs an announcement or discussion.//
=== Rollback plan
//Describe the rollback plan in production for this task if something goes wrong.//
//This task was created by Version 1.0.0 of the Reader Experience team task template using [[ https://phabulous.toolforge.org/ | phabulous ]].//