Camera didn’t start? Quick fixes:

• Open over HTTPS (or http://localhost). Files opened as file:// won’t work.
• Make sure the tab isn’t inside another app’s iframe. Open in a new tab/window.
• Safari/iOS: keep the page in the foreground and tap Start Camera again.

Fast local server (any OS):

# Python 3
python -m http.server 8000
# then open: http://localhost:8000/face-doodles-v1.1.0.html