Background:
In order to provide a better reading experience through a large set of users, we want to be able to allow users to increase and decrease the font size of articles.
In mobile web beta in the settings menu there is a font changer which allows the user to increase font size via JavaScript.
Acceptance criteria
- font changer is promoted to stable (turning on beta does not provide access to the feature) in the feature branch 'specialpages'
- font changer appears in "Settings" tab separate from beta
Additional notes
Review notes (which are likely to be outdated) in T109363
Do not deploy this until T169369: Change font size controls to use small, regular, large and extra large buckets and additional QA is complete