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1. Activate MathJax on fr.wikipedia.org
2. Go to 'Fonction du second degré' (https://fr.wikipedia.org/wiki/Fonction_du_second_degr%C3%A9)
3. Find the first image
4. Click on the formula in the description

You will get a zoom of the formula, but captive of the thumbnail, so you can’t see it fully.

This is caused by the overflow:hidden on the thumbinnner class of the thumbnail code.

I don't remember exactly why we have overflow:hidden on thumbnails, but I believe it had something to do with the video players and other 'non-image' thumbnails.