look directly at camera and make sure that detection passes all of the required tests noted on the right hand side of the screen
if input does not satisfies tests within specific timeout, no image will be selected
once face image is approved, it will be compared with existing face database
you can also store face descriptor with label in a browser's indexdb for future usage
note: this is not equivalent to full faceid methods as used by modern mobile phones or windows hello
as they rely on additional infrared sensors and depth-sensing and not just camera image for additional levels of security