There are also tools that check your HTTP headers. While securityheaders checks for Permission-Policy being used, I can imagine it will be improved to check for

There are also tools that check your HTTP headers. While securityheaders checks for Permission-Policy being used, I can imagine it will be improved to check for the "interest-cohort" value in the future. - https://securityheaders.com https://securityheaders.com - https://observatory.mozilla.org https://observatory.mozilla.org