As I was looking at this answer on SO mobile site on my iPhone, an animated profile picture caught my attention.

Animated gifs are not allowed on profile pictures, but this one managed to show up on the mobile site.

###Mobile

<img src="https://i.sstatic.net/xSw3h.gif?s=30&g=1" alt="">

###Desktop

<img src="https://i.sstatic.net/xSw3h.gif?s=32&g=1" alt="">