This is basically what you are describing: https://webkit.org/blog/11312/meet-face-id-and-touch-id-for-the-web/ https://webkit.org/blog/11312/meet-face-id-and-t

This is basically what you are describing: https://webkit.org/blog/11312/meet-face-id-and-touch-id-for-the-web/ https://webkit.org/blog/11312/meet-face-id-and-touch-id-for-... It's not widely adopted, unfortunately.