I was having a strange issue where all the superscript text on Wikipedia would cause huge gaps — giant line height.

I’d get to see big gaps between or in midst of paragraphs.

But best see for yourself: Screenshot of the problem

Apparently this line spacing issue is caused by an erroneous font description in the DejaVu Sans Condensed font: This font inspector application says: Superscript y offset = 13400 (Screenshot by equinox.)

I have since removed the font, and the problem is gone.