Starting at about 4. July there are many (aproximatly one every two days) reports on [[de:Wikipedia:Fragen_zur_Wikipedia]] (the dewiki village pump) about issues obviously caused by badly nested HTML. Purging fixes the issue, but it seems like tidy wasn't executed in these cases. Since this kind of issue occurs now definitly more frequently than before, it should be investigated why tidy refuses to work so often.
Version: unspecified
Severity: major
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=58042