Currently, many of the daily ruby browser tests are failing.
The Investigation T211696 has revealed that some tests fail with the timed out after 15 seconds, Element was not visible in 15 seconds (Watir::Wait::TimeoutError) error message.
Investigate and fix the cause for this error.
The Mediawiki wiki has a guide on how to run these tests locally. These errors also occured locally, but for different tests.