Verified in the linked URL (I'm using Chrome, Win7, Vector), all I did was adding a few words at the top. I'll add that the edit did trigger the "corrupted edit, please check" warning, but I didn't verify what that caught, since the article is very large.

Version: unspecified
Severity: critical
URL: https://en.wikipedia.org/w/index.php?title=User%3AElitre_%28WMF%29%2FSandbox&diff=598527246&oldid=598527036
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=53853