how does "mouse-demo" manage to get pixel-precision tracking?

[grondilu]

I'm writing a chess module in raku and thanks to Kitty's terminal protocol, I can display a chess position right inside the terminal:

It would be pretty cool if I could also input moves with the mouse for instance to play against an engine or to train tactics or whatever. To do that I would need pixel-accurate mouse tracking which seems possible in kitty as demonstrated by the kitten mouse-demo. However, this doesn't seem to be documented.

Any ideas?

[neurocyte]

SGR-Pixels is the keyword you want to google for. This is supported in many terminals and is not kitty specific.