This page does ONE thing: trace your eye movements so we can verify gaze tracking actually works on your hardware.

1 · Start the camera and put your face in the box (it turns green when positioned well).
2 · Calibrate: look at each dot — and click it 3 times while looking at it (clicks train the model hardest; on a phone, tap it).
3 · Watch the trail follow your eyes, then run the accuracy test for a pixel-error score.

Sit ~50 cm away · even front lighting · keep your head as still as you can.