Unfortunately this is what happens when you marketing promises instead of libraries. If CNCF wasn't that eager to market OTel over Opencensus this spec would have evolved naturally but you know, this is business work.

In JS you use (if using zipkin) https://github.com/openzipkin/zipkin-js/tree/master/packages.... If you have further questions, feel free to come to https://gitter.im/openzipkin/zipkin and people will help you with more details.