Manufacturers who sell TVs in the UK & want the TV to run BBC iPlayer (BBC Public Service live/on-demand TV app) have to get their TVs certified by us. There's a large suite of tests & technical requirements - a colleague just pointed out to me that those docs are public:

https://certification.bbctvapps.co.uk/docs/tv-specification/

TVs on UK sale now & marked with the iPlayer logo must support:
* TLS 1.2+
* Mutual TLS (client certs)
* HTTP/2+
* Service Workers
& lots more...those just caught my eye