Last modified: 2014-09-30 21:58:42 UTC
At https://en.wikipedia.org/w/index.php?title=Judi_Dench&curid=85432&diff=568314406&oldid=568147939 the article was top and tailed with <embed type="application/x-datavault" width="0" height="0" /> Searching seems to suggest the most likely cause is the "DataVault" password manager browser plugin
I've send an email to their support department. Let's hope it helps.
Did you get anything back, Derk-Jan?
Change 163961 had a related patch set uploaded by Alex Monk: Remove certain blacklisted elements when getting HTML from document https://gerrit.wikimedia.org/r/163961
Change 163961 merged by jenkins-bot: Remove certain blacklisted elements when getting HTML from document https://gerrit.wikimedia.org/r/163961