Steps to replicate the issue:
- On a mobile device, look at any diff, e.g., https://en.wikipedia.org/wiki/Special:MobileDiff/1186693770. NOTE: I'm unable to reproduce this with mobile URLs on a laptop.
Expected result:
Buttons are available to switch between visual and wikitext diffs (as was the case until recently).
Actual result:
No buttons are available. I'm stuck with whatever mode the diff is in, which appears to be the mode of the last diff I did on my laptop.