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WebRTC is UDP. It's not easy, but it's there!

nitpick: It can be either

It is possible to use only one or the other.

With the exception of the QUIC protocol.

* TLS over 443/udp

Well, neither can TCP.

HTTP is built on top of TCP.

Websockets are TCP connections.

So? TCP cannot be used directly in the browser by applications authors. It's an abstraction.

Couldn't you potentially use something like WebRTC to get UDP functionality in the browser?