Since a02a7ff8eab9, warnings are wrapped in <div class="errorbox"></div> but the messages themselves have HTML escaped (the message should look like this).
This affects at least AbuseFilter and SpamBlacklist warnings.
Reports:
- https://cs.wikipedia.org/w/index.php?title=Wikipedie:Pod_l%C3%ADpou_(technika)&diff=14245913&oldid=14236672
- https://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_(technical)&diff=746515947&oldid=746512747
- https://ru.wikipedia.org/wiki/File:AbuseFilterMessageBug.png