Local YouTube Whitelist Probe

Purpose: test only the narrow Chrome + Windows + file:// local-playback candidates before integrating them into the app. This page does not wait. It shows the candidate embeds immediately so you can see whether any of them work on this exact machine.

Environment

Open Playlist On YouTube Open Canonical Embed

Whitelist Rule Under Test

Try local embed only when all are true:

• app address starts with file://

• browser family is Chrome (not Edge/Opera)

• platform is Windows