New error in 1.41.0-wmf.5
124 errors in last 1hr
Seems to be due to a misuse of classList.add which is being passed multiple classes.
https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/add
We should use apply arguments instead.
QA steps
- Login and visit https://en.wikipedia.beta.wmflabs.org/wiki/Dog
- Click the echo icon
- Verify that what is depicted in T335149#8796958 has been resolved