The first thing I have done to make sure this is not a crazy browser exploit was: document.onmousemove = console.log No console logs until I really move the m

The first thing I have done to make sure this is not a crazy browser exploit was: document.onmousemove = console.log No console logs until I really move the mouse. Then I opened Chrome DevTools and checked what resources are loaded on the network tab, once I saw this, I figured the trick: https://www.attejuvonen.fi/mouse/arrow_m.png https://www.attejuvonen.fi/mouse/arrow_m.png Since I'm on Ubuntu like the author, the moust indeed seems like my original one. This is a fun one :)