What is actually running: the Viola–Jones cascade from 2001 —
25 stages, 2913 Haar features, the same haarcascade_frontalface_default.xml
that OpenCV ships — reimplemented in JavaScript on this page. It only detects faces pointed at
the camera, so when you tilt your head down to your phone it stops seeing you. That dropout
is the doomscroll signal. Full write-up →