See for instance
https://fr.wikipedia.org/w/index.php?title=Philippe_Juvin&diff=101226971&oldid=101177693 .
The edit added <span style="font-size:12.0pt;font-family:"Times New Roman","serif"; mso-fareast-font-family:Calibri;mso-ansi-language:EN-GB;mso-fareast-language: EN-US;mso-bidi-language:AR-SA"> to a newly added reference.
It was reported by NicoV at fr.wp, I haven't had a chance to see if it can be reproduced or how yet.
See Also:
- T60689: VisualEditor: Reference dialog retains style of copy/pasted contents
- T71821: Pasting lists from Microsoft Word (MS Office) injects hidden HTML cruft like <!--[if !supportLists]-->-
- T71513: VisualEditor: Copying from Microsoft Word adds XML cruft like " <w:WordDocument> " (mso = Microsoft Office)
- T75292: VisualEditor: Paste from Word to Firefox inserts garbage