Notification toolbar rendering on 2015-09-14 as if partially transparent versions of the Alerts/Messages boxes are overlaying pages (i.e. transparent broken versions of the notification boxes that normally open when you click their icon in the toolbar).
<a href="//commons.wikimedia.org/wiki/User:RP88" title="User:RP88">RP88</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>