Last modified: 2014-06-26 00:34:49 UTC
At the bottom of that diff you can see I copypasted some text between <small>near other words which were already small, causing <small> tags galore (it reminded me of bug 52189, except there's of course no button in the interface to set text size yet) - Win7, Chrome. NicoV noticed it in this diff https://fr.wikipedia.org/w/index.php?title=Le_Flingueur_%28film%2C_2011%29&diff=103613466&oldid=103204882 which BTW features more disruption which may or may not need to be filed separately (in case, let me know); he reproduced the extra smalling thing, and has my same setup.
This is intentional; lots of pages (sadly) use <small>Foo <small>Bar</small> Baz</small> (and the same with <big>).