v151 · live route · permissions policy

Header Echo Lab

Build the merged Chrome 151 policy, fetch a real endpoint that returns the matching Permissions-Policy response header, and compare it with the legacy three-directive version that older deployments may still carry.

local-network loopback-network iframe allow attribute

policy API
checking

response header
pending

echo payload

No request yet.

generated config

implementation reference

Need the exact API surface, compatibility boundaries, errors, lifecycle, and source links? Read the matching gendn reference ↗